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Posted to commits@texera.apache.org by gi...@apache.org on 2026/07/28 23:51:43 UTC

(texera) 01/02: fix: Add missing license headers to Docs (#6958)

This is an automated email from the ASF dual-hosted git repository.

github-merge-queue[bot] pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/texera.git

commit 214402f0524bcadc08ef78ccfd2f493891fafe6f
Author: Ian Maxon <pa...@gmail.com>
AuthorDate: Tue Jul 28 16:33:44 2026 -0700

    fix: Add missing license headers to Docs (#6958)
    
    ### What changes were proposed in this PR?
    This just adds missing license headers to the markdown documentation and
    other markdown files in the source. It also enables checking of markdown
    files for these headers via skywalking eyes by changing the .licenserc
    config.
    
    ### Performance Impact
    None- these are headers in doc files.
    
    ### Any related issues, documentation, discussions?
    
    Closes #6955
    Would be a follow on to the inital addition of license headers to other
    source files, e.g. https://github.com/apache/texera/pull/3415 and
    https://github.com/apache/texera/issues/4135
    
    related vote thread:
    https://lists.apache.org/thread/x12wsodfyhqs1fxr95fw6ngyw1xxn5jk
    
    ### How was this PR tested?
    If the CI check passes it should be fine. I only allowed one file which
    I think is not under ASL2, but mentioned elsewhere
    
    ### Was this PR authored or co-authored using generative AI tooling?
    No.
    
    Co-authored-by: Yicong Huang <17...@users.noreply.github.com>
---
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 .../operators/database-connector/asterixdb-source.md  | 19 +++++++++++++++++++
 .../operators/database-connector/mysql-source.md      | 19 +++++++++++++++++++
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 .../reference/operators/external-api/reddit-search.md | 19 +++++++++++++++++++
 .../external-api/twitter-full-archive-search-api.md   | 19 +++++++++++++++++++
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 docs/reference/operators/external-api/url-fetcher.md  | 19 +++++++++++++++++++
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 .../operators/machine-learning/hugging-face/_index.md | 19 +++++++++++++++++++
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 .../visualization/statistical/boxviolin-plot.md       | 19 +++++++++++++++++++
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 .../operators/visualization/statistical/histogram.md  | 19 +++++++++++++++++++
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 .../visualization/statistical/scatter-matrix-chart.md | 19 +++++++++++++++++++
 .../visualization/statistical/strip-chart.md          | 19 +++++++++++++++++++
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 docs/reference/storage.md                             | 19 +++++++++++++++++++
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 docs/tutorials/_index.md                              | 19 +++++++++++++++++++
 docs/tutorials/create-dataset-upload-data.md          | 19 +++++++++++++++++++
 docs/tutorials/guide-for-how-to-use-texera.md         | 19 +++++++++++++++++++
 docs/tutorials/guide-to-enable-llm-agent.md           | 19 +++++++++++++++++++
 docs/tutorials/guide-to-use-python-udf.md             | 19 +++++++++++++++++++
 docs/tutorials/migrate-jupyter-notebook.md            | 19 +++++++++++++++++++
 frontend/AGENTS.md                                    | 19 +++++++++++++++++++
 frontend/README.md                                    | 19 +++++++++++++++++++
 frontend/TESTING.md                                   | 19 +++++++++++++++++++
 pyright-language-service/README.md                    | 19 +++++++++++++++++++
 243 files changed, 4598 insertions(+), 1 deletion(-)

diff --git a/.github/release/vote-email-template.md b/.github/release/vote-email-template.md
index 83b2ba7926..5b8c9082f9 100644
--- a/.github/release/vote-email-template.md
+++ b/.github/release/vote-email-template.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 Subject: [VOTE] Release Apache Texera (incubating) ${VERSION} RC${RC_NUM}
 
 Hi Texera Community,
diff --git a/.licenserc.yaml b/.licenserc.yaml
index 794a5466bc..4ce2a44884 100644
--- a/.licenserc.yaml
+++ b/.licenserc.yaml
@@ -5,7 +5,7 @@ header:
 
   paths-ignore:
     - 'licenses'
-    - '**/*.md'
+    - 'licenses-3rd-party-code'
     - '**/*.csv'
     - '**/*.txt'
     - '**/*.json'
diff --git a/AGENTS.md b/AGENTS.md
index a330f9712c..b21ed6d6a1 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # AGENTS.md
 
 ## Architecture Map
diff --git a/CLAUDE.md b/CLAUDE.md
index 5c64d0f0e3..9c5e6a1b78 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # CLAUDE.md
 
 Use the project guidance in [AGENTS.md](AGENTS.md).
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 78881c4525..7557eb7a28 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # Contributing to Texera
 
 Thank you for your interest in contributing to Texera! Please follow the steps below to submit your contributions effectively. We follow a **fork-based development workflow** and adopt the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) specification for commit messages and pull request titles.
diff --git a/README.md b/README.md
index b1dbadd118..49f371c297 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 <h1 align="center">Apache Texera - Human-AI Collaborative Data Science Using Visual Workflows</h1>
 
 <p align="center">
diff --git a/SECURITY.md b/SECURITY.md
index 9f7a5d9941..8f424e1419 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # Security Policy
 
 This document outlines Apache Texera (Incubating)'s security model, deployment considerations, and procedures for
diff --git a/amber/README.md b/amber/README.md
index 8b13789179..e27485396e 100644
--- a/amber/README.md
+++ b/amber/README.md
@@ -1 +1,19 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
 
diff --git a/bin/README.md b/bin/README.md
index 2592cefe38..7dd25dc35a 100644
--- a/bin/README.md
+++ b/bin/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # `bin/`
 
 This directory holds the scripts, Dockerfiles, and configuration used to
diff --git a/bin/k8s/README.md b/bin/k8s/README.md
index 95d6cb7bb4..192a9e076e 100644
--- a/bin/k8s/README.md
+++ b/bin/k8s/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # Kubernetes Deployment
 
 Refer to https://github.com/Texera/texera/wiki/Install-Texera for details.
diff --git a/bin/local-dev/README.md b/bin/local-dev/README.md
index 17ae1b7c11..a560f9098b 100644
--- a/bin/local-dev/README.md
+++ b/bin/local-dev/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # Texera local dev tooling
 
 This folder backs `bin/local-dev.sh` — the single entry point for bringing
diff --git a/bin/single-node/README.md b/bin/single-node/README.md
index 81ef01e65e..d9fda11617 100644
--- a/bin/single-node/README.md
+++ b/bin/single-node/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 This document describes how to set up and run Texera on a single machine using "Docker Compose".
 
 ## Prerequisites
diff --git a/docs/_index.md b/docs/_index.md
index 1542d83fae..543f7def4c 100644
--- a/docs/_index.md
+++ b/docs/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Texera Documentation
 ---
diff --git a/docs/concepts/_index.md b/docs/concepts/_index.md
index f5000f2c2e..78b7338b3a 100644
--- a/docs/concepts/_index.md
+++ b/docs/concepts/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Concepts
 description: >
diff --git a/docs/contribution-guidelines/_index.md b/docs/contribution-guidelines/_index.md
index e8507aa67c..eb062a7529 100644
--- a/docs/contribution-guidelines/_index.md
+++ b/docs/contribution-guidelines/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Contribution Guidelines"
 description: "How to contribute to Texera code and documentation."
diff --git a/docs/contribution-guidelines/apache-license-header.md b/docs/contribution-guidelines/apache-license-header.md
index cdbc95a795..f4089bc34f 100644
--- a/docs/contribution-guidelines/apache-license-header.md
+++ b/docs/contribution-guidelines/apache-license-header.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Apache License header"
 weight: 70
diff --git a/docs/contribution-guidelines/guide-for-developers.md b/docs/contribution-guidelines/guide-for-developers.md
index 696a1e9abe..077746390d 100644
--- a/docs/contribution-guidelines/guide-for-developers.md
+++ b/docs/contribution-guidelines/guide-for-developers.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide for Developers"
 weight: 20
diff --git a/docs/contribution-guidelines/guide-to-frontend-development.md b/docs/contribution-guidelines/guide-to-frontend-development.md
index fbc8a3938d..e7f84c7720 100644
--- a/docs/contribution-guidelines/guide-to-frontend-development.md
+++ b/docs/contribution-guidelines/guide-to-frontend-development.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide to Frontend Development (new gui)"
 weight: 30
diff --git a/docs/contribution-guidelines/guide-to-implement-java-operator.md b/docs/contribution-guidelines/guide-to-implement-java-operator.md
index 34ac4d0086..e4afda2dd8 100644
--- a/docs/contribution-guidelines/guide-to-implement-java-operator.md
+++ b/docs/contribution-guidelines/guide-to-implement-java-operator.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide to Implement a Java Native Operator"
 weight: 40
diff --git a/docs/contribution-guidelines/guide-to-implement-python-operator.md b/docs/contribution-guidelines/guide-to-implement-python-operator.md
index a41c69d214..6ffeccbd22 100644
--- a/docs/contribution-guidelines/guide-to-implement-python-operator.md
+++ b/docs/contribution-guidelines/guide-to-implement-python-operator.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide to Implement a Python Native Operator (converting from a Python UDF)"
 weight: 50
diff --git a/docs/contribution-guidelines/making-contributions.md b/docs/contribution-guidelines/making-contributions.md
index cd6b165d37..10389307a0 100644
--- a/docs/contribution-guidelines/making-contributions.md
+++ b/docs/contribution-guidelines/making-contributions.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Making Contributions"
 weight: 10
diff --git a/docs/contribution-guidelines/release-email-template.md b/docs/contribution-guidelines/release-email-template.md
index 9fdca5cc45..21f3d5c403 100644
--- a/docs/contribution-guidelines/release-email-template.md
+++ b/docs/contribution-guidelines/release-email-template.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "[VOTE] Release Apache Texera (incubating) Email Template"
 weight: 80
diff --git a/docs/examples/_index.md b/docs/examples/_index.md
index 886672dfea..c548cf74dc 100644
--- a/docs/examples/_index.md
+++ b/docs/examples/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Examples
 description: Explore example workflows and applications built with Texera.
diff --git a/docs/getting-started/AccessLogin.md b/docs/getting-started/AccessLogin.md
index 3400936547..842022bb0d 100644
--- a/docs/getting-started/AccessLogin.md
+++ b/docs/getting-started/AccessLogin.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Access/Login to Texera"
 date: 2025-10-29
diff --git a/docs/getting-started/_index.md b/docs/getting-started/_index.md
index d4df43b6ea..6b78c66a03 100644
--- a/docs/getting-started/_index.md
+++ b/docs/getting-started/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Getting Started"
 weight: 20
diff --git a/docs/getting-started/install-texera.md b/docs/getting-started/install-texera.md
index 3f0f19c2aa..fe93220680 100644
--- a/docs/getting-started/install-texera.md
+++ b/docs/getting-started/install-texera.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Install Texera"
 weight: 10
diff --git a/docs/getting-started/installing-using-docker.md b/docs/getting-started/installing-using-docker.md
index 179ec87916..b77e446c0e 100644
--- a/docs/getting-started/installing-using-docker.md
+++ b/docs/getting-started/installing-using-docker.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Installing Apache Texera using Docker"
 weight: 20
diff --git a/docs/getting-started/run-on-kubernetes.md b/docs/getting-started/run-on-kubernetes.md
index c1addd9d36..6503b8dc91 100644
--- a/docs/getting-started/run-on-kubernetes.md
+++ b/docs/getting-started/run-on-kubernetes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "How to run Texera on local Kubernetes"
 weight: 60
diff --git a/docs/getting-started/ui-overview.md b/docs/getting-started/ui-overview.md
index 590c89e17d..5f4aaa8ff2 100644
--- a/docs/getting-started/ui-overview.md
+++ b/docs/getting-started/ui-overview.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Texera UI Overview"
 date: 2025-10-29
diff --git a/docs/overview.md b/docs/overview.md
index e657abaa10..2b232db723 100644
--- a/docs/overview.md
+++ b/docs/overview.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Overview
 description: High-level overview of the Texera architecture, core concepts, and use cases.
diff --git a/docs/reference/_index.md b/docs/reference/_index.md
index bf4228c7e9..deb1247591 100644
--- a/docs/reference/_index.md
+++ b/docs/reference/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Reference
 description: In-depth technical and configuration references for Texera’s components and environment.
diff --git a/docs/reference/configuration.md b/docs/reference/configuration.md
index a951acd729..cafba3e94d 100644
--- a/docs/reference/configuration.md
+++ b/docs/reference/configuration.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Configuration
 description: In-depth technical and configuration references for Texera’s components and environment.
diff --git a/docs/reference/engine.md b/docs/reference/engine.md
index 1368e1ad38..0ae6a93b0e 100644
--- a/docs/reference/engine.md
+++ b/docs/reference/engine.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Engine
 description: In-depth technical and configuration references for Texera’s components and environment.
diff --git a/docs/reference/frontend.md b/docs/reference/frontend.md
index 74e0dac3e0..9a3223927b 100644
--- a/docs/reference/frontend.md
+++ b/docs/reference/frontend.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Frontend
 description: In-depth technical and configuration references for Texera’s components and environment.
diff --git a/docs/reference/operators/_index.md b/docs/reference/operators/_index.md
index 479a277687..3f41ce3aa8 100644
--- a/docs/reference/operators/_index.md
+++ b/docs/reference/operators/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Operators"
 description: "Complete reference for all Texera operators organized by category"
diff --git a/docs/reference/operators/control-block/_index.md b/docs/reference/operators/control-block/_index.md
index 6664541565..6a4dd74d6b 100644
--- a/docs/reference/operators/control-block/_index.md
+++ b/docs/reference/operators/control-block/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Control Block"
 description: "Operators in the Control Block category"
diff --git a/docs/reference/operators/control-block/if.md b/docs/reference/operators/control-block/if.md
index 6e20b4cf36..732a2dab3a 100644
--- a/docs/reference/operators/control-block/if.md
+++ b/docs/reference/operators/control-block/if.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "If"
 description: "If"
diff --git a/docs/reference/operators/control-block/sleep.md b/docs/reference/operators/control-block/sleep.md
index 36956db257..2e97545b2d 100644
--- a/docs/reference/operators/control-block/sleep.md
+++ b/docs/reference/operators/control-block/sleep.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sleep"
 description: "Sleep n seconds between each tuple"
diff --git a/docs/reference/operators/data-cleaning/_index.md b/docs/reference/operators/data-cleaning/_index.md
index aa2d64db73..9355774923 100644
--- a/docs/reference/operators/data-cleaning/_index.md
+++ b/docs/reference/operators/data-cleaning/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Data Cleaning"
 description: "Operators in the Data Cleaning category"
diff --git a/docs/reference/operators/data-cleaning/aggregate/_index.md b/docs/reference/operators/data-cleaning/aggregate/_index.md
index 8b92426426..8f1781a904 100644
--- a/docs/reference/operators/data-cleaning/aggregate/_index.md
+++ b/docs/reference/operators/data-cleaning/aggregate/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Aggregate"
 description: "Operators in the Aggregate category"
diff --git a/docs/reference/operators/data-cleaning/aggregate/aggregate.md b/docs/reference/operators/data-cleaning/aggregate/aggregate.md
index 1fcd883d7c..9878d59635 100644
--- a/docs/reference/operators/data-cleaning/aggregate/aggregate.md
+++ b/docs/reference/operators/data-cleaning/aggregate/aggregate.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Aggregate"
 description: "Calculate different types of aggregation values"
diff --git a/docs/reference/operators/data-cleaning/distinct.md b/docs/reference/operators/data-cleaning/distinct.md
index d6a4e4e61c..aad3b08897 100644
--- a/docs/reference/operators/data-cleaning/distinct.md
+++ b/docs/reference/operators/data-cleaning/distinct.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Distinct"
 description: "Remove duplicate tuples"
diff --git a/docs/reference/operators/data-cleaning/filter.md b/docs/reference/operators/data-cleaning/filter.md
index 04f8ab7eb0..54af25f378 100644
--- a/docs/reference/operators/data-cleaning/filter.md
+++ b/docs/reference/operators/data-cleaning/filter.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Filter"
 description: "Performs a filter operation using OR between multiple predicates"
diff --git a/docs/reference/operators/data-cleaning/join/_index.md b/docs/reference/operators/data-cleaning/join/_index.md
index 1adb376f49..e6248a913f 100644
--- a/docs/reference/operators/data-cleaning/join/_index.md
+++ b/docs/reference/operators/data-cleaning/join/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Join"
 description: "Operators in the Join category"
diff --git a/docs/reference/operators/data-cleaning/join/cartesian-product.md b/docs/reference/operators/data-cleaning/join/cartesian-product.md
index cf21aac328..8ef6a86284 100644
--- a/docs/reference/operators/data-cleaning/join/cartesian-product.md
+++ b/docs/reference/operators/data-cleaning/join/cartesian-product.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Cartesian Product"
 description: "Append fields together to get the cartesian product of two inputs"
diff --git a/docs/reference/operators/data-cleaning/join/hash-join.md b/docs/reference/operators/data-cleaning/join/hash-join.md
index c3b5e6f7bb..d59c39dff9 100644
--- a/docs/reference/operators/data-cleaning/join/hash-join.md
+++ b/docs/reference/operators/data-cleaning/join/hash-join.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hash Join"
 description: "Join two inputs"
diff --git a/docs/reference/operators/data-cleaning/join/interval-join.md b/docs/reference/operators/data-cleaning/join/interval-join.md
index 4f3e6369ec..b4cbab37a4 100644
--- a/docs/reference/operators/data-cleaning/join/interval-join.md
+++ b/docs/reference/operators/data-cleaning/join/interval-join.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Interval Join"
 description: "Join two inputs with left table join key in the range of [right table join key, right table join key + constant value]"
diff --git a/docs/reference/operators/data-cleaning/limit.md b/docs/reference/operators/data-cleaning/limit.md
index 175266e3c0..868d208746 100644
--- a/docs/reference/operators/data-cleaning/limit.md
+++ b/docs/reference/operators/data-cleaning/limit.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Limit"
 description: "Limit the number of output rows"
diff --git a/docs/reference/operators/data-cleaning/projection.md b/docs/reference/operators/data-cleaning/projection.md
index c74feb8f81..0b37693b35 100644
--- a/docs/reference/operators/data-cleaning/projection.md
+++ b/docs/reference/operators/data-cleaning/projection.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Projection"
 description: "Keeps or drops the column"
diff --git a/docs/reference/operators/data-cleaning/set/_index.md b/docs/reference/operators/data-cleaning/set/_index.md
index 96a24006bd..47fd74cbf8 100644
--- a/docs/reference/operators/data-cleaning/set/_index.md
+++ b/docs/reference/operators/data-cleaning/set/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Set"
 description: "Operators in the Set category"
diff --git a/docs/reference/operators/data-cleaning/set/difference.md b/docs/reference/operators/data-cleaning/set/difference.md
index 32516860ab..4cc3d879ac 100644
--- a/docs/reference/operators/data-cleaning/set/difference.md
+++ b/docs/reference/operators/data-cleaning/set/difference.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Difference"
 description: "Find the set difference of two inputs"
diff --git a/docs/reference/operators/data-cleaning/set/intersect.md b/docs/reference/operators/data-cleaning/set/intersect.md
index 043c61adb5..3c1cb59ba5 100644
--- a/docs/reference/operators/data-cleaning/set/intersect.md
+++ b/docs/reference/operators/data-cleaning/set/intersect.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Intersect"
 description: "Take the intersect of two inputs"
diff --git a/docs/reference/operators/data-cleaning/set/symmetricdifference.md b/docs/reference/operators/data-cleaning/set/symmetricdifference.md
index 7ea0ba7cd9..a70a8686ba 100644
--- a/docs/reference/operators/data-cleaning/set/symmetricdifference.md
+++ b/docs/reference/operators/data-cleaning/set/symmetricdifference.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "SymmetricDifference"
 description: "Find the symmetric difference (the set of elements which are in either of the sets, but not in their intersection) of two inputs"
diff --git a/docs/reference/operators/data-cleaning/set/union.md b/docs/reference/operators/data-cleaning/set/union.md
index be3dc42b27..4f0bd8f871 100644
--- a/docs/reference/operators/data-cleaning/set/union.md
+++ b/docs/reference/operators/data-cleaning/set/union.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Union"
 description: "Unions the output rows from multiple input operators"
diff --git a/docs/reference/operators/data-cleaning/sort/_index.md b/docs/reference/operators/data-cleaning/sort/_index.md
index 08879a55da..f9e8883dfd 100644
--- a/docs/reference/operators/data-cleaning/sort/_index.md
+++ b/docs/reference/operators/data-cleaning/sort/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sort"
 description: "Operators in the Sort category"
diff --git a/docs/reference/operators/data-cleaning/sort/sort-partitions.md b/docs/reference/operators/data-cleaning/sort/sort-partitions.md
index 36bff365e7..6de22e8dd3 100644
--- a/docs/reference/operators/data-cleaning/sort/sort-partitions.md
+++ b/docs/reference/operators/data-cleaning/sort/sort-partitions.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sort Partitions"
 description: "Sort Partitions"
diff --git a/docs/reference/operators/data-cleaning/sort/sort.md b/docs/reference/operators/data-cleaning/sort/sort.md
index d5d2c6ea44..a06bfa15c9 100644
--- a/docs/reference/operators/data-cleaning/sort/sort.md
+++ b/docs/reference/operators/data-cleaning/sort/sort.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sort"
 description: "Sort based on the columns and sorting methods"
diff --git a/docs/reference/operators/data-cleaning/sort/stable-merge-sort.md b/docs/reference/operators/data-cleaning/sort/stable-merge-sort.md
index 9ceb678b5e..69688b5012 100644
--- a/docs/reference/operators/data-cleaning/sort/stable-merge-sort.md
+++ b/docs/reference/operators/data-cleaning/sort/stable-merge-sort.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Stable Merge Sort"
 description: "Stable per-partition sort with multi-key ordering (incremental stack of sorted buckets)"
diff --git a/docs/reference/operators/data-cleaning/type-casting.md b/docs/reference/operators/data-cleaning/type-casting.md
index 444add1a4b..843e0e4361 100644
--- a/docs/reference/operators/data-cleaning/type-casting.md
+++ b/docs/reference/operators/data-cleaning/type-casting.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Type Casting"
 description: "Cast between types"
diff --git a/docs/reference/operators/data-input/_index.md b/docs/reference/operators/data-input/_index.md
index a8565e3c9e..a78b8490aa 100644
--- a/docs/reference/operators/data-input/_index.md
+++ b/docs/reference/operators/data-input/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Data Input"
 description: "Operators in the Data Input category"
diff --git a/docs/reference/operators/data-input/arrow-file-scan.md b/docs/reference/operators/data-input/arrow-file-scan.md
index b0a1313bba..f6ded0d87b 100644
--- a/docs/reference/operators/data-input/arrow-file-scan.md
+++ b/docs/reference/operators/data-input/arrow-file-scan.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Arrow File Scan"
 description: "Scan data from an Arrow file"
diff --git a/docs/reference/operators/data-input/csv-file-scan.md b/docs/reference/operators/data-input/csv-file-scan.md
index 93e3b03950..366ffaccae 100644
--- a/docs/reference/operators/data-input/csv-file-scan.md
+++ b/docs/reference/operators/data-input/csv-file-scan.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "CSV File Scan"
 description: "Scan data from a CSV file"
diff --git a/docs/reference/operators/data-input/csvold-file-scan.md b/docs/reference/operators/data-input/csvold-file-scan.md
index dbf993eb26..6b43701a0d 100644
--- a/docs/reference/operators/data-input/csvold-file-scan.md
+++ b/docs/reference/operators/data-input/csvold-file-scan.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "CSVOld File Scan"
 description: "Scan data from a CSVOld file"
diff --git a/docs/reference/operators/data-input/file-lister.md b/docs/reference/operators/data-input/file-lister.md
index 071e434fd0..de37dc1e55 100644
--- a/docs/reference/operators/data-input/file-lister.md
+++ b/docs/reference/operators/data-input/file-lister.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "File Lister"
 description: "Select a dataset version and output one filename tuple per file"
diff --git a/docs/reference/operators/data-input/file-scan-from-input.md b/docs/reference/operators/data-input/file-scan-from-input.md
index 5ab9cdc285..dc53e4fdfd 100644
--- a/docs/reference/operators/data-input/file-scan-from-input.md
+++ b/docs/reference/operators/data-input/file-scan-from-input.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "File Scan From Input"
 description: "Scan data from file paths provided by input tuples"
diff --git a/docs/reference/operators/data-input/file-scan.md b/docs/reference/operators/data-input/file-scan.md
index cb29c77f9f..b945f7bb71 100644
--- a/docs/reference/operators/data-input/file-scan.md
+++ b/docs/reference/operators/data-input/file-scan.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "File Scan"
 description: "Scan data from a file"
diff --git a/docs/reference/operators/data-input/jsonl-file-scan.md b/docs/reference/operators/data-input/jsonl-file-scan.md
index b6a77eacdc..e1f3a8fa52 100644
--- a/docs/reference/operators/data-input/jsonl-file-scan.md
+++ b/docs/reference/operators/data-input/jsonl-file-scan.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "JSONL File Scan"
 description: "Scan data from a JSONL file"
diff --git a/docs/reference/operators/data-input/text-input.md b/docs/reference/operators/data-input/text-input.md
index ca41d47919..b4343939bd 100644
--- a/docs/reference/operators/data-input/text-input.md
+++ b/docs/reference/operators/data-input/text-input.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Text Input"
 description: "Source data from manually inputted text"
diff --git a/docs/reference/operators/database-connector/_index.md b/docs/reference/operators/database-connector/_index.md
index b2895071ae..85d62ad2d7 100644
--- a/docs/reference/operators/database-connector/_index.md
+++ b/docs/reference/operators/database-connector/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Database Connector"
 description: "Operators in the Database Connector category"
diff --git a/docs/reference/operators/database-connector/asterixdb-source.md b/docs/reference/operators/database-connector/asterixdb-source.md
index bb704de43b..df1b638dd9 100644
--- a/docs/reference/operators/database-connector/asterixdb-source.md
+++ b/docs/reference/operators/database-connector/asterixdb-source.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "AsterixDB Source"
 description: "Read data from a AsterixDB instance"
diff --git a/docs/reference/operators/database-connector/mysql-source.md b/docs/reference/operators/database-connector/mysql-source.md
index ed4e42d805..42b1ffe1f5 100644
--- a/docs/reference/operators/database-connector/mysql-source.md
+++ b/docs/reference/operators/database-connector/mysql-source.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "MySQL Source"
 description: "Read data from a MySQL instance"
diff --git a/docs/reference/operators/database-connector/postgresql-source.md b/docs/reference/operators/database-connector/postgresql-source.md
index 31ecad4181..9e6aab6637 100644
--- a/docs/reference/operators/database-connector/postgresql-source.md
+++ b/docs/reference/operators/database-connector/postgresql-source.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "PostgreSQL Source"
 description: "Read data from a PostgreSQL instance"
diff --git a/docs/reference/operators/external-api/_index.md b/docs/reference/operators/external-api/_index.md
index a100996ead..2174c77212 100644
--- a/docs/reference/operators/external-api/_index.md
+++ b/docs/reference/operators/external-api/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "External API"
 description: "Operators in the External API category"
diff --git a/docs/reference/operators/external-api/reddit-search.md b/docs/reference/operators/external-api/reddit-search.md
index 54d20e44d0..7d2a1f6961 100644
--- a/docs/reference/operators/external-api/reddit-search.md
+++ b/docs/reference/operators/external-api/reddit-search.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Reddit Search"
 description: "Search for recent posts with python-wrapped Reddit API, PRAW"
diff --git a/docs/reference/operators/external-api/twitter-full-archive-search-api.md b/docs/reference/operators/external-api/twitter-full-archive-search-api.md
index 675b5483bf..537542a8c6 100644
--- a/docs/reference/operators/external-api/twitter-full-archive-search-api.md
+++ b/docs/reference/operators/external-api/twitter-full-archive-search-api.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Twitter Full Archive Search API"
 description: "Retrieve data from Twitter Full Archive Search API"
diff --git a/docs/reference/operators/external-api/twitter-search-api.md b/docs/reference/operators/external-api/twitter-search-api.md
index e5bfbd69ec..d994fd45fd 100644
--- a/docs/reference/operators/external-api/twitter-search-api.md
+++ b/docs/reference/operators/external-api/twitter-search-api.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Twitter Search API"
 description: "Retrieve data from Twitter Search API"
diff --git a/docs/reference/operators/external-api/url-fetcher.md b/docs/reference/operators/external-api/url-fetcher.md
index d76f1647e0..b4411bf6b7 100644
--- a/docs/reference/operators/external-api/url-fetcher.md
+++ b/docs/reference/operators/external-api/url-fetcher.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "URL Fetcher"
 description: "Fetch the content of a single URL"
diff --git a/docs/reference/operators/machine-learning/_index.md b/docs/reference/operators/machine-learning/_index.md
index ebafa7ed86..e129f662ad 100644
--- a/docs/reference/operators/machine-learning/_index.md
+++ b/docs/reference/operators/machine-learning/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Machine Learning"
 description: "Operators in the Machine Learning category"
diff --git a/docs/reference/operators/machine-learning/advanced-sklearn/_index.md b/docs/reference/operators/machine-learning/advanced-sklearn/_index.md
index 47bc69edcb..5b6e67d3ba 100644
--- a/docs/reference/operators/machine-learning/advanced-sklearn/_index.md
+++ b/docs/reference/operators/machine-learning/advanced-sklearn/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Advanced Sklearn"
 description: "Operators in the Advanced Sklearn category"
diff --git a/docs/reference/operators/machine-learning/advanced-sklearn/knn-classifier.md b/docs/reference/operators/machine-learning/advanced-sklearn/knn-classifier.md
index fc9f6e1f3e..66a3282fe5 100644
--- a/docs/reference/operators/machine-learning/advanced-sklearn/knn-classifier.md
+++ b/docs/reference/operators/machine-learning/advanced-sklearn/knn-classifier.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "KNN Classifier"
 description: "Sklearn KNN Classifier Operator"
diff --git a/docs/reference/operators/machine-learning/advanced-sklearn/knn-regressor.md b/docs/reference/operators/machine-learning/advanced-sklearn/knn-regressor.md
index d3af7abf5b..d63f3bf83f 100644
--- a/docs/reference/operators/machine-learning/advanced-sklearn/knn-regressor.md
+++ b/docs/reference/operators/machine-learning/advanced-sklearn/knn-regressor.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "KNN Regressor"
 description: "Sklearn KNN Regressor Operator"
diff --git a/docs/reference/operators/machine-learning/advanced-sklearn/svm-classifier.md b/docs/reference/operators/machine-learning/advanced-sklearn/svm-classifier.md
index 1dae7c9933..22d3cb022d 100644
--- a/docs/reference/operators/machine-learning/advanced-sklearn/svm-classifier.md
+++ b/docs/reference/operators/machine-learning/advanced-sklearn/svm-classifier.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "SVM Classifier"
 description: "Sklearn SVM Classifier Operator"
diff --git a/docs/reference/operators/machine-learning/advanced-sklearn/svm-regressor.md b/docs/reference/operators/machine-learning/advanced-sklearn/svm-regressor.md
index ec17ac2f56..2988ab6a98 100644
--- a/docs/reference/operators/machine-learning/advanced-sklearn/svm-regressor.md
+++ b/docs/reference/operators/machine-learning/advanced-sklearn/svm-regressor.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "SVM Regressor"
 description: "Sklearn SVM Regressor Operator"
diff --git a/docs/reference/operators/machine-learning/hugging-face/_index.md b/docs/reference/operators/machine-learning/hugging-face/_index.md
index 34155ed172..469bf9ddca 100644
--- a/docs/reference/operators/machine-learning/hugging-face/_index.md
+++ b/docs/reference/operators/machine-learning/hugging-face/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hugging Face"
 description: "Operators in the Hugging Face category"
diff --git a/docs/reference/operators/machine-learning/hugging-face/hugging-face-iris-logistic-regression.md b/docs/reference/operators/machine-learning/hugging-face/hugging-face-iris-logistic-regression.md
index 11fa340066..eb3364881f 100644
--- a/docs/reference/operators/machine-learning/hugging-face/hugging-face-iris-logistic-regression.md
+++ b/docs/reference/operators/machine-learning/hugging-face/hugging-face-iris-logistic-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hugging Face Iris Logistic Regression"
 description: "Predict whether an iris is an Iris-setosa using a pre-trained logistic regression model"
diff --git a/docs/reference/operators/machine-learning/hugging-face/hugging-face-sentiment-analysis.md b/docs/reference/operators/machine-learning/hugging-face/hugging-face-sentiment-analysis.md
index 07d3fe2c87..57b85f21d9 100644
--- a/docs/reference/operators/machine-learning/hugging-face/hugging-face-sentiment-analysis.md
+++ b/docs/reference/operators/machine-learning/hugging-face/hugging-face-sentiment-analysis.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hugging Face Sentiment Analysis"
 description: "Analyzing Sentiments with a Twitter-Based Model from Hugging Face"
diff --git a/docs/reference/operators/machine-learning/hugging-face/hugging-face-spam-detection.md b/docs/reference/operators/machine-learning/hugging-face/hugging-face-spam-detection.md
index a6fbc15ce9..d746df3562 100644
--- a/docs/reference/operators/machine-learning/hugging-face/hugging-face-spam-detection.md
+++ b/docs/reference/operators/machine-learning/hugging-face/hugging-face-spam-detection.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hugging Face Spam Detection"
 description: "Spam Detection by SMS Spam Detection Model from Hugging Face"
diff --git a/docs/reference/operators/machine-learning/hugging-face/hugging-face-text-summarization.md b/docs/reference/operators/machine-learning/hugging-face/hugging-face-text-summarization.md
index 930f3582fb..6093dfb109 100644
--- a/docs/reference/operators/machine-learning/hugging-face/hugging-face-text-summarization.md
+++ b/docs/reference/operators/machine-learning/hugging-face/hugging-face-text-summarization.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hugging Face Text Summarization"
 description: "Summarize the given text content with a mini2bert pre-trained model from Hugging Face"
diff --git a/docs/reference/operators/machine-learning/machine-learning-general/_index.md b/docs/reference/operators/machine-learning/machine-learning-general/_index.md
index 3b3c791716..8057603fe3 100644
--- a/docs/reference/operators/machine-learning/machine-learning-general/_index.md
+++ b/docs/reference/operators/machine-learning/machine-learning-general/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Machine Learning General"
 description: "Operators in the Machine Learning General category"
diff --git a/docs/reference/operators/machine-learning/machine-learning-general/machine-learning-scorer.md b/docs/reference/operators/machine-learning/machine-learning-general/machine-learning-scorer.md
index f958e9451a..87eb47c468 100644
--- a/docs/reference/operators/machine-learning/machine-learning-general/machine-learning-scorer.md
+++ b/docs/reference/operators/machine-learning/machine-learning-general/machine-learning-scorer.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Machine Learning Scorer"
 description: "Scorer for machine learning models"
diff --git a/docs/reference/operators/machine-learning/sklearn/_index.md b/docs/reference/operators/machine-learning/sklearn/_index.md
index fa9ab353be..2ee650d884 100644
--- a/docs/reference/operators/machine-learning/sklearn/_index.md
+++ b/docs/reference/operators/machine-learning/sklearn/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sklearn"
 description: "Operators in the Sklearn category"
diff --git a/docs/reference/operators/machine-learning/sklearn/adaptive-boosting.md b/docs/reference/operators/machine-learning/sklearn/adaptive-boosting.md
index 752d7c1831..e4739faca1 100644
--- a/docs/reference/operators/machine-learning/sklearn/adaptive-boosting.md
+++ b/docs/reference/operators/machine-learning/sklearn/adaptive-boosting.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Adaptive Boosting"
 description: "Sklearn Adaptive Boosting Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/bagging.md b/docs/reference/operators/machine-learning/sklearn/bagging.md
index 2912cb3ab3..978d87279f 100644
--- a/docs/reference/operators/machine-learning/sklearn/bagging.md
+++ b/docs/reference/operators/machine-learning/sklearn/bagging.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Bagging"
 description: "Sklearn Bagging Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/bernoulli-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/bernoulli-naive-bayes.md
index 02ff845f2d..b872cec65f 100644
--- a/docs/reference/operators/machine-learning/sklearn/bernoulli-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/bernoulli-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Bernoulli Naive Bayes"
 description: "Sklearn Bernoulli Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/complement-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/complement-naive-bayes.md
index f1bb4f679d..99d98f9bf1 100644
--- a/docs/reference/operators/machine-learning/sklearn/complement-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/complement-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Complement Naive Bayes"
 description: "Sklearn Complement Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/decision-tree.md b/docs/reference/operators/machine-learning/sklearn/decision-tree.md
index fdf53879e7..3a5a9929f7 100644
--- a/docs/reference/operators/machine-learning/sklearn/decision-tree.md
+++ b/docs/reference/operators/machine-learning/sklearn/decision-tree.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Decision Tree"
 description: "Sklearn Decision Tree Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/dummy-classifier.md b/docs/reference/operators/machine-learning/sklearn/dummy-classifier.md
index c86b9f8328..60eb34545b 100644
--- a/docs/reference/operators/machine-learning/sklearn/dummy-classifier.md
+++ b/docs/reference/operators/machine-learning/sklearn/dummy-classifier.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Dummy Classifier"
 description: "Sklearn Dummy Classifier Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/extra-tree.md b/docs/reference/operators/machine-learning/sklearn/extra-tree.md
index 8b4fbb7740..b28bdc4926 100644
--- a/docs/reference/operators/machine-learning/sklearn/extra-tree.md
+++ b/docs/reference/operators/machine-learning/sklearn/extra-tree.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Extra Tree"
 description: "Sklearn Extra Tree Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/extra-trees.md b/docs/reference/operators/machine-learning/sklearn/extra-trees.md
index 7530a0953a..438b5d34e2 100644
--- a/docs/reference/operators/machine-learning/sklearn/extra-trees.md
+++ b/docs/reference/operators/machine-learning/sklearn/extra-trees.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Extra Trees"
 description: "Sklearn Extra Trees Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/gaussian-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/gaussian-naive-bayes.md
index cad63f0cc3..281611bbb1 100644
--- a/docs/reference/operators/machine-learning/sklearn/gaussian-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/gaussian-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Gaussian Naive Bayes"
 description: "Sklearn Gaussian Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/gradient-boosting.md b/docs/reference/operators/machine-learning/sklearn/gradient-boosting.md
index 34545f7945..4c3392a774 100644
--- a/docs/reference/operators/machine-learning/sklearn/gradient-boosting.md
+++ b/docs/reference/operators/machine-learning/sklearn/gradient-boosting.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Gradient Boosting"
 description: "Sklearn Gradient Boosting Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/k-nearest-neighbors.md b/docs/reference/operators/machine-learning/sklearn/k-nearest-neighbors.md
index 5b283923e3..2482646708 100644
--- a/docs/reference/operators/machine-learning/sklearn/k-nearest-neighbors.md
+++ b/docs/reference/operators/machine-learning/sklearn/k-nearest-neighbors.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "K-nearest Neighbors"
 description: "Sklearn K-nearest Neighbors Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/linear-perceptron.md b/docs/reference/operators/machine-learning/sklearn/linear-perceptron.md
index 20d677bae3..15f13207fa 100644
--- a/docs/reference/operators/machine-learning/sklearn/linear-perceptron.md
+++ b/docs/reference/operators/machine-learning/sklearn/linear-perceptron.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Linear Perceptron"
 description: "Sklearn Linear Perceptron Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/linear-regression.md b/docs/reference/operators/machine-learning/sklearn/linear-regression.md
index 6c0a06eabc..9240d57aac 100644
--- a/docs/reference/operators/machine-learning/sklearn/linear-regression.md
+++ b/docs/reference/operators/machine-learning/sklearn/linear-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Linear Regression"
 description: "Sklearn Linear Regression Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/linear-support-vector-machine.md b/docs/reference/operators/machine-learning/sklearn/linear-support-vector-machine.md
index 435b31baae..862b166d63 100644
--- a/docs/reference/operators/machine-learning/sklearn/linear-support-vector-machine.md
+++ b/docs/reference/operators/machine-learning/sklearn/linear-support-vector-machine.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Linear Support Vector Machine"
 description: "Sklearn Linear Support Vector Machine Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/logistic-regression-cross-validation.md b/docs/reference/operators/machine-learning/sklearn/logistic-regression-cross-validation.md
index a0cc646297..768ad2812a 100644
--- a/docs/reference/operators/machine-learning/sklearn/logistic-regression-cross-validation.md
+++ b/docs/reference/operators/machine-learning/sklearn/logistic-regression-cross-validation.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Logistic Regression Cross Validation"
 description: "Sklearn Logistic Regression Cross Validation Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/logistic-regression.md b/docs/reference/operators/machine-learning/sklearn/logistic-regression.md
index 95fc9f9121..1c062f8ad4 100644
--- a/docs/reference/operators/machine-learning/sklearn/logistic-regression.md
+++ b/docs/reference/operators/machine-learning/sklearn/logistic-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Logistic Regression"
 description: "Sklearn Logistic Regression Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/multi-layer-perceptron.md b/docs/reference/operators/machine-learning/sklearn/multi-layer-perceptron.md
index 3ead69698f..5be5da8453 100644
--- a/docs/reference/operators/machine-learning/sklearn/multi-layer-perceptron.md
+++ b/docs/reference/operators/machine-learning/sklearn/multi-layer-perceptron.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Multi-layer Perceptron"
 description: "Sklearn Multi-layer Perceptron Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/multinomial-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/multinomial-naive-bayes.md
index 7da1e59a9a..c50becf6f3 100644
--- a/docs/reference/operators/machine-learning/sklearn/multinomial-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/multinomial-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Multinomial Naive Bayes"
 description: "Sklearn Multinomial Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/nearest-centroid.md b/docs/reference/operators/machine-learning/sklearn/nearest-centroid.md
index 18e1d2b5c7..dadce200ea 100644
--- a/docs/reference/operators/machine-learning/sklearn/nearest-centroid.md
+++ b/docs/reference/operators/machine-learning/sklearn/nearest-centroid.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Nearest Centroid"
 description: "Sklearn Nearest Centroid Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/passive-aggressive.md b/docs/reference/operators/machine-learning/sklearn/passive-aggressive.md
index 42904f20a3..a169e8dad6 100644
--- a/docs/reference/operators/machine-learning/sklearn/passive-aggressive.md
+++ b/docs/reference/operators/machine-learning/sklearn/passive-aggressive.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Passive Aggressive"
 description: "Sklearn Passive Aggressive Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/probability-calibration.md b/docs/reference/operators/machine-learning/sklearn/probability-calibration.md
index 118b90f023..a864ada7a5 100644
--- a/docs/reference/operators/machine-learning/sklearn/probability-calibration.md
+++ b/docs/reference/operators/machine-learning/sklearn/probability-calibration.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Probability Calibration"
 description: "Sklearn Probability Calibration Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/random-forest.md b/docs/reference/operators/machine-learning/sklearn/random-forest.md
index 25e531fd2d..d02a3bbb09 100644
--- a/docs/reference/operators/machine-learning/sklearn/random-forest.md
+++ b/docs/reference/operators/machine-learning/sklearn/random-forest.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Random Forest"
 description: "Sklearn Random Forest Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/ridge-regression-cross-validation.md b/docs/reference/operators/machine-learning/sklearn/ridge-regression-cross-validation.md
index ebf8e9a96c..380fef7df0 100644
--- a/docs/reference/operators/machine-learning/sklearn/ridge-regression-cross-validation.md
+++ b/docs/reference/operators/machine-learning/sklearn/ridge-regression-cross-validation.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Ridge Regression Cross Validation"
 description: "Sklearn Ridge Regression Cross Validation Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/ridge-regression.md b/docs/reference/operators/machine-learning/sklearn/ridge-regression.md
index ad3ca7a2dd..14d0e82485 100644
--- a/docs/reference/operators/machine-learning/sklearn/ridge-regression.md
+++ b/docs/reference/operators/machine-learning/sklearn/ridge-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Ridge Regression"
 description: "Sklearn Ridge Regression Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-prediction.md b/docs/reference/operators/machine-learning/sklearn/sklearn-prediction.md
index 15e8ac0cad..7b9464a3a8 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-prediction.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-prediction.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sklearn Prediction"
 description: "Sklearn Prediction Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-testing.md b/docs/reference/operators/machine-learning/sklearn/sklearn-testing.md
index 0083b8c878..28a668b469 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-testing.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-testing.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sklearn Testing"
 description: "It will generate scorers for Sklearn model"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/_index.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/_index.md
index 60b5009743..b8f43e3e5c 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/_index.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sklearn Training"
 description: "Operators in the Sklearn Training category"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-adaptive-boosting.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-adaptive-boosting.md
index d9646d6989..363a6d2f52 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-adaptive-boosting.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-adaptive-boosting.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Adaptive Boosting"
 description: "Sklearn Training: Adaptive Boosting Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bagging-training.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bagging-training.md
index 6a18653f6c..7a3bcb008a 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bagging-training.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bagging-training.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Bagging Training"
 description: "Sklearn Training: Bagging Training Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bernoulli-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bernoulli-naive-bayes.md
index b0774f6942..a6c89e5ef3 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bernoulli-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-bernoulli-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Bernoulli Naive Bayes"
 description: "Sklearn Training: Bernoulli Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-complement-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-complement-naive-bayes.md
index 03b5aeb286..30378c5ca3 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-complement-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-complement-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Complement Naive Bayes"
 description: "Sklearn Training: Complement Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-decision-tree.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-decision-tree.md
index cdcddb0d08..8c82208715 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-decision-tree.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-decision-tree.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Decision Tree"
 description: "Sklearn Training: Decision Tree Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-dummy-classifier.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-dummy-classifier.md
index de8c5953a9..4854ce8d96 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-dummy-classifier.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-dummy-classifier.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Dummy Classifier"
 description: "Sklearn Training: Dummy Classifier Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-tree.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-tree.md
index 4c107817de..b206f42088 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-tree.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-tree.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Extra Tree"
 description: "Sklearn Training: Extra Tree Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-trees.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-trees.md
index c4fe3cf1d9..9de512ee29 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-trees.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-extra-trees.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Extra Trees"
 description: "Sklearn Training: Extra Trees Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gaussian-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gaussian-naive-bayes.md
index 02d67ad080..7262ea4f70 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gaussian-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gaussian-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Gaussian Naive Bayes"
 description: "Sklearn Training: Gaussian Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gradient-boosting.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gradient-boosting.md
index 7b9bce6c34..4b1e6d54ad 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gradient-boosting.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-gradient-boosting.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Gradient Boosting"
 description: "Sklearn Training: Gradient Boosting Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-k-nearest-neighbors.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-k-nearest-neighbors.md
index 518cca9bec..8599c03dbb 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-k-nearest-neighbors.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-k-nearest-neighbors.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: K-nearest Neighbors"
 description: "Sklearn Training: K-nearest Neighbors Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-perceptron.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-perceptron.md
index 8f5bfaf8f4..c7c2aedd01 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-perceptron.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-perceptron.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Linear Perceptron"
 description: "Sklearn Training: Linear Perceptron Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-regression.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-regression.md
index dda268962f..743ab5f742 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-regression.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Linear Regression"
 description: "Sklearn Training: Linear Regression Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-support-vector-machine.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-support-vector-machine.md
index c1f4f07eff..75f3e496eb 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-support-vector-machine.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-linear-support-vector-machine.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Linear Support Vector Machine"
 description: "Sklearn Training: Linear Support Vector Machine Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression-cross-validation.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression-cross-validation.md
index ba147f748e..89eea43f58 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression-cross-validation.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression-cross-validation.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Logistic Regression Cross Validation"
 description: "Sklearn Training: Logistic Regression Cross Validation Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression.md
index 3cfd94e954..d7959186ac 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-logistic-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Logistic Regression"
 description: "Sklearn Training: Logistic Regression Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multi-layer-perceptron.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multi-layer-perceptron.md
index a2228d953d..9643a63736 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multi-layer-perceptron.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multi-layer-perceptron.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Multi-layer Perceptron"
 description: "Sklearn Training: Multi-layer Perceptron Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multinomial-naive-bayes.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multinomial-naive-bayes.md
index f1f7376b60..4416af9656 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multinomial-naive-bayes.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-multinomial-naive-bayes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Multinomial Naive Bayes"
 description: "Sklearn Training: Multinomial Naive Bayes Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-nearest-centroid.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-nearest-centroid.md
index 5b249d3ec9..8987596fd4 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-nearest-centroid.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-nearest-centroid.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Nearest Centroid"
 description: "Sklearn Training: Nearest Centroid Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-passive-aggressive.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-passive-aggressive.md
index 9c46f61403..f872dcaab6 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-passive-aggressive.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-passive-aggressive.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Passive Aggressive"
 description: "Sklearn Training: Passive Aggressive Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-probability-calibration.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-probability-calibration.md
index 937cbcaac4..df69065064 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-probability-calibration.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-probability-calibration.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Probability Calibration"
 description: "Sklearn Training: Probability Calibration Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-random-forest.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-random-forest.md
index fed2f3a741..6dfe4f217a 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-random-forest.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-random-forest.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Random Forest"
 description: "Sklearn Training: Random Forest Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression-cross-validation.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression-cross-validation.md
index 9c916ad98a..9b6a0e1b08 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression-cross-validation.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression-cross-validation.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Ridge Regression Cross Validation"
 description: "Sklearn Training: Ridge Regression Cross Validation Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression.md
index 4bc3e96afd..1af6e898d2 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-ridge-regression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Ridge Regression"
 description: "Sklearn Training: Ridge Regression Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-stochastic-gradient-descent.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-stochastic-gradient-descent.md
index 2afa8af625..f558953d96 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-stochastic-gradient-descent.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-stochastic-gradient-descent.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Stochastic Gradient Descent"
 description: "Sklearn Training: Stochastic Gradient Descent Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-support-vector-machine.md b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-support-vector-machine.md
index 3b638adb39..3410708664 100644
--- a/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-support-vector-machine.md
+++ b/docs/reference/operators/machine-learning/sklearn/sklearn-training/training-support-vector-machine.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Training: Support Vector Machine"
 description: "Sklearn Training: Support Vector Machine Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/stochastic-gradient-descent.md b/docs/reference/operators/machine-learning/sklearn/stochastic-gradient-descent.md
index 5fc61e9b5d..d3022d4955 100644
--- a/docs/reference/operators/machine-learning/sklearn/stochastic-gradient-descent.md
+++ b/docs/reference/operators/machine-learning/sklearn/stochastic-gradient-descent.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Stochastic Gradient Descent"
 description: "Sklearn Stochastic Gradient Descent Operator"
diff --git a/docs/reference/operators/machine-learning/sklearn/support-vector-machine.md b/docs/reference/operators/machine-learning/sklearn/support-vector-machine.md
index a5aec071d9..1d538f7c33 100644
--- a/docs/reference/operators/machine-learning/sklearn/support-vector-machine.md
+++ b/docs/reference/operators/machine-learning/sklearn/support-vector-machine.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Support Vector Machine"
 description: "Sklearn Support Vector Machine Operator"
diff --git a/docs/reference/operators/output-modes.md b/docs/reference/operators/output-modes.md
index cfec34b28e..412fb948a3 100644
--- a/docs/reference/operators/output-modes.md
+++ b/docs/reference/operators/output-modes.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Output Port Modes"
 description: "Reference for operator output port modes"
diff --git a/docs/reference/operators/parameters/_index.md b/docs/reference/operators/parameters/_index.md
index c004196a69..cd0e743a42 100644
--- a/docs/reference/operators/parameters/_index.md
+++ b/docs/reference/operators/parameters/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Parameter Reference"
 description: "Complete reference for machine learning operator parameters"
diff --git a/docs/reference/operators/parameters/sklearn-advanced-knn-parameters.md b/docs/reference/operators/parameters/sklearn-advanced-knn-parameters.md
index 66cb36f5e0..a86239358e 100644
--- a/docs/reference/operators/parameters/sklearn-advanced-knn-parameters.md
+++ b/docs/reference/operators/parameters/sklearn-advanced-knn-parameters.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "SklearnAdvancedKNN Parameters"
 description: "Hyperparameters accepted by SklearnAdvancedKNN"
diff --git a/docs/reference/operators/parameters/sklearn-advanced-svc-parameters.md b/docs/reference/operators/parameters/sklearn-advanced-svc-parameters.md
index b2db4cece9..11ae3ddcb3 100644
--- a/docs/reference/operators/parameters/sklearn-advanced-svc-parameters.md
+++ b/docs/reference/operators/parameters/sklearn-advanced-svc-parameters.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "SklearnAdvancedSVC Parameters"
 description: "Hyperparameters accepted by SklearnAdvancedSVC"
diff --git a/docs/reference/operators/parameters/sklearn-advanced-svr-parameters.md b/docs/reference/operators/parameters/sklearn-advanced-svr-parameters.md
index 18ba40d7bc..5bb0c8aafc 100644
--- a/docs/reference/operators/parameters/sklearn-advanced-svr-parameters.md
+++ b/docs/reference/operators/parameters/sklearn-advanced-svr-parameters.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "SklearnAdvancedSVR Parameters"
 description: "Hyperparameters accepted by SklearnAdvancedSVR"
diff --git a/docs/reference/operators/search/_index.md b/docs/reference/operators/search/_index.md
index 33e37cdcfc..389fe86bc3 100644
--- a/docs/reference/operators/search/_index.md
+++ b/docs/reference/operators/search/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Search"
 description: "Operators in the Search category"
diff --git a/docs/reference/operators/search/dictionary-matcher.md b/docs/reference/operators/search/dictionary-matcher.md
index 07702ec61a..2db9d371d5 100644
--- a/docs/reference/operators/search/dictionary-matcher.md
+++ b/docs/reference/operators/search/dictionary-matcher.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Dictionary matcher"
 description: "Matches tuples if they appear in a given dictionary"
diff --git a/docs/reference/operators/search/keyword-search.md b/docs/reference/operators/search/keyword-search.md
index 4cf9d487f8..026b716fc8 100644
--- a/docs/reference/operators/search/keyword-search.md
+++ b/docs/reference/operators/search/keyword-search.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Keyword Search"
 description: "Search for keyword(s) in a string column"
diff --git a/docs/reference/operators/search/regular-expression.md b/docs/reference/operators/search/regular-expression.md
index 45bf5c5b82..381ac10fea 100644
--- a/docs/reference/operators/search/regular-expression.md
+++ b/docs/reference/operators/search/regular-expression.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Regular Expression"
 description: "Search a regular expression in a string column"
diff --git a/docs/reference/operators/search/substring-search.md b/docs/reference/operators/search/substring-search.md
index 1b4bc447b8..b6e532d87b 100644
--- a/docs/reference/operators/search/substring-search.md
+++ b/docs/reference/operators/search/substring-search.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Substring Search"
 description: "Search for Substring(s) in a string column"
diff --git a/docs/reference/operators/user-defined-functions/_index.md b/docs/reference/operators/user-defined-functions/_index.md
index c6c6d10d13..fa0f2eb594 100644
--- a/docs/reference/operators/user-defined-functions/_index.md
+++ b/docs/reference/operators/user-defined-functions/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "User-defined Functions"
 description: "Operators in the User-defined Functions category"
diff --git a/docs/reference/operators/user-defined-functions/java/_index.md b/docs/reference/operators/user-defined-functions/java/_index.md
index 56d99ceb13..b57eb929cf 100644
--- a/docs/reference/operators/user-defined-functions/java/_index.md
+++ b/docs/reference/operators/user-defined-functions/java/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Java"
 description: "Operators in the Java category"
diff --git a/docs/reference/operators/user-defined-functions/java/java-udf.md b/docs/reference/operators/user-defined-functions/java/java-udf.md
index 527b62b303..3ce521bd36 100644
--- a/docs/reference/operators/user-defined-functions/java/java-udf.md
+++ b/docs/reference/operators/user-defined-functions/java/java-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Java UDF"
 description: "User-defined function operator in Java script"
diff --git a/docs/reference/operators/user-defined-functions/python/1-out-python-udf.md b/docs/reference/operators/user-defined-functions/python/1-out-python-udf.md
index 9b66833399..8c0729125b 100644
--- a/docs/reference/operators/user-defined-functions/python/1-out-python-udf.md
+++ b/docs/reference/operators/user-defined-functions/python/1-out-python-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "1-out Python UDF"
 description: "User-defined function operator in Python script"
diff --git a/docs/reference/operators/user-defined-functions/python/2-in-python-udf.md b/docs/reference/operators/user-defined-functions/python/2-in-python-udf.md
index 86fc89fc54..d305f5ec33 100644
--- a/docs/reference/operators/user-defined-functions/python/2-in-python-udf.md
+++ b/docs/reference/operators/user-defined-functions/python/2-in-python-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "2-in Python UDF"
 description: "User-defined function operator in Python script"
diff --git a/docs/reference/operators/user-defined-functions/python/_index.md b/docs/reference/operators/user-defined-functions/python/_index.md
index c2addb5026..2ad98d4d60 100644
--- a/docs/reference/operators/user-defined-functions/python/_index.md
+++ b/docs/reference/operators/user-defined-functions/python/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Python"
 description: "Operators in the Python category"
diff --git a/docs/reference/operators/user-defined-functions/python/python-lambda-function.md b/docs/reference/operators/user-defined-functions/python/python-lambda-function.md
index b92c91a94a..0c14a878a2 100644
--- a/docs/reference/operators/user-defined-functions/python/python-lambda-function.md
+++ b/docs/reference/operators/user-defined-functions/python/python-lambda-function.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Python Lambda Function"
 description: "Modify or add a new column with more ease"
diff --git a/docs/reference/operators/user-defined-functions/python/python-table-reducer.md b/docs/reference/operators/user-defined-functions/python/python-table-reducer.md
index abdbe41de8..86c0b81b5e 100644
--- a/docs/reference/operators/user-defined-functions/python/python-table-reducer.md
+++ b/docs/reference/operators/user-defined-functions/python/python-table-reducer.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Python Table Reducer"
 description: "Reduce Table to Tuple"
diff --git a/docs/reference/operators/user-defined-functions/python/python-udf.md b/docs/reference/operators/user-defined-functions/python/python-udf.md
index 07a586a91d..93e951ee61 100644
--- a/docs/reference/operators/user-defined-functions/python/python-udf.md
+++ b/docs/reference/operators/user-defined-functions/python/python-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Python UDF"
 description: "User-defined function operator in Python script"
diff --git a/docs/reference/operators/user-defined-functions/r/1-out-r-udf.md b/docs/reference/operators/user-defined-functions/r/1-out-r-udf.md
index 6ef99858d3..f119b8f500 100644
--- a/docs/reference/operators/user-defined-functions/r/1-out-r-udf.md
+++ b/docs/reference/operators/user-defined-functions/r/1-out-r-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "1-out R UDF"
 description: "User-defined function operator in R script"
diff --git a/docs/reference/operators/user-defined-functions/r/_index.md b/docs/reference/operators/user-defined-functions/r/_index.md
index ddc35eccda..ed74c27b85 100644
--- a/docs/reference/operators/user-defined-functions/r/_index.md
+++ b/docs/reference/operators/user-defined-functions/r/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "R"
 description: "Operators in the R category"
diff --git a/docs/reference/operators/user-defined-functions/r/r-udf.md b/docs/reference/operators/user-defined-functions/r/r-udf.md
index e63e0eb068..626ba4caec 100644
--- a/docs/reference/operators/user-defined-functions/r/r-udf.md
+++ b/docs/reference/operators/user-defined-functions/r/r-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "R UDF"
 description: "User-defined function operator in R script"
diff --git a/docs/reference/operators/utilities/_index.md b/docs/reference/operators/utilities/_index.md
index 67a2909906..c66a8c5718 100644
--- a/docs/reference/operators/utilities/_index.md
+++ b/docs/reference/operators/utilities/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Utilities"
 description: "Operators in the Utilities category"
diff --git a/docs/reference/operators/utilities/random-k-sampling.md b/docs/reference/operators/utilities/random-k-sampling.md
index 2e20a14d3c..cc1f5fabe9 100644
--- a/docs/reference/operators/utilities/random-k-sampling.md
+++ b/docs/reference/operators/utilities/random-k-sampling.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Random K Sampling"
 description: "Random sampling with given percentage"
diff --git a/docs/reference/operators/utilities/reservoir-sampling.md b/docs/reference/operators/utilities/reservoir-sampling.md
index 489da767b9..6b82b5b885 100644
--- a/docs/reference/operators/utilities/reservoir-sampling.md
+++ b/docs/reference/operators/utilities/reservoir-sampling.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Reservoir Sampling"
 description: "Reservoir Sampling with k items being kept randomly"
diff --git a/docs/reference/operators/utilities/split.md b/docs/reference/operators/utilities/split.md
index a6a51bf25d..6013b8b989 100644
--- a/docs/reference/operators/utilities/split.md
+++ b/docs/reference/operators/utilities/split.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Split"
 description: "Split data to two different ports"
diff --git a/docs/reference/operators/utilities/unnest-string.md b/docs/reference/operators/utilities/unnest-string.md
index 4d3836c6cb..a785be6afc 100644
--- a/docs/reference/operators/utilities/unnest-string.md
+++ b/docs/reference/operators/utilities/unnest-string.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Unnest String"
 description: "Unnest the string values in the column separated by a delimiter to multiple values"
diff --git a/docs/reference/operators/visualization/_index.md b/docs/reference/operators/visualization/_index.md
index c8a25bb8ab..3d81946737 100644
--- a/docs/reference/operators/visualization/_index.md
+++ b/docs/reference/operators/visualization/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Visualization"
 description: "Operators in the Visualization category"
diff --git a/docs/reference/operators/visualization/advanced/_index.md b/docs/reference/operators/visualization/advanced/_index.md
index 364557d45f..17fa54b393 100644
--- a/docs/reference/operators/visualization/advanced/_index.md
+++ b/docs/reference/operators/visualization/advanced/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Advanced"
 description: "Operators in the Advanced category"
diff --git a/docs/reference/operators/visualization/advanced/choropleth-map.md b/docs/reference/operators/visualization/advanced/choropleth-map.md
index 71d5c0fb11..6f867124db 100644
--- a/docs/reference/operators/visualization/advanced/choropleth-map.md
+++ b/docs/reference/operators/visualization/advanced/choropleth-map.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Choropleth Map"
 description: "Visualize data using a Choropleth Map that uses shades of colors to show differences in properties or quantities between regions"
diff --git a/docs/reference/operators/visualization/advanced/scatter3d-chart.md b/docs/reference/operators/visualization/advanced/scatter3d-chart.md
index 3afff65266..554b08a4b9 100644
--- a/docs/reference/operators/visualization/advanced/scatter3d-chart.md
+++ b/docs/reference/operators/visualization/advanced/scatter3d-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Scatter3D Chart"
 description: "Visualize data in a Scatter3D Plot"
diff --git a/docs/reference/operators/visualization/basic/_index.md b/docs/reference/operators/visualization/basic/_index.md
index 9bb2aae286..1ede87fa3e 100644
--- a/docs/reference/operators/visualization/basic/_index.md
+++ b/docs/reference/operators/visualization/basic/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Basic"
 description: "Operators in the Basic category"
diff --git a/docs/reference/operators/visualization/basic/bar-chart.md b/docs/reference/operators/visualization/basic/bar-chart.md
index 5a978fbef8..8204e651f0 100644
--- a/docs/reference/operators/visualization/basic/bar-chart.md
+++ b/docs/reference/operators/visualization/basic/bar-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Bar Chart"
 description: "Visualize data in a Bar Chart"
diff --git a/docs/reference/operators/visualization/basic/bubble-chart.md b/docs/reference/operators/visualization/basic/bubble-chart.md
index 4806e7a0f0..e1dde75f62 100644
--- a/docs/reference/operators/visualization/basic/bubble-chart.md
+++ b/docs/reference/operators/visualization/basic/bubble-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Bubble Chart"
 description: "A 3D Scatter Plot; Bubbles are graphed using x and y labels, and their sizes determined by a z-value."
diff --git a/docs/reference/operators/visualization/basic/dot-plot.md b/docs/reference/operators/visualization/basic/dot-plot.md
index 7b1830b4bb..c7f3517dbd 100644
--- a/docs/reference/operators/visualization/basic/dot-plot.md
+++ b/docs/reference/operators/visualization/basic/dot-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Dot Plot"
 description: "Visualize data using a dot plot"
diff --git a/docs/reference/operators/visualization/basic/dumbbell-plot.md b/docs/reference/operators/visualization/basic/dumbbell-plot.md
index da45d77e96..6cca8f7102 100644
--- a/docs/reference/operators/visualization/basic/dumbbell-plot.md
+++ b/docs/reference/operators/visualization/basic/dumbbell-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Dumbbell Plot"
 description: "Visualize data in a Dumbbell Plot. A dumbbell plot (also known as a lollipop chart) is typically used to compare two distinct values or time points for the same entity."
diff --git a/docs/reference/operators/visualization/basic/figure-factory-table.md b/docs/reference/operators/visualization/basic/figure-factory-table.md
index 87f7dac098..7f2361f1fc 100644
--- a/docs/reference/operators/visualization/basic/figure-factory-table.md
+++ b/docs/reference/operators/visualization/basic/figure-factory-table.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Figure Factory Table"
 description: "Visualize data in a figure factory table"
diff --git a/docs/reference/operators/visualization/basic/filled-area-plot.md b/docs/reference/operators/visualization/basic/filled-area-plot.md
index d68653f74b..77636726cb 100644
--- a/docs/reference/operators/visualization/basic/filled-area-plot.md
+++ b/docs/reference/operators/visualization/basic/filled-area-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Filled Area Plot"
 description: "Visualize data in a filled area plot"
diff --git a/docs/reference/operators/visualization/basic/gantt-chart.md b/docs/reference/operators/visualization/basic/gantt-chart.md
index 93067ad89e..c39abe933e 100644
--- a/docs/reference/operators/visualization/basic/gantt-chart.md
+++ b/docs/reference/operators/visualization/basic/gantt-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Gantt Chart"
 description: "A Gantt chart is a type of bar chart that illustrates a project schedule. The chart lists the tasks to be performed on the vertical axis, and time intervals on the horizontal axis. The width of the horizontal bars in the graph shows the duration of each activity."
diff --git a/docs/reference/operators/visualization/basic/hierarchy-chart.md b/docs/reference/operators/visualization/basic/hierarchy-chart.md
index d5e956182c..380ecfacb7 100644
--- a/docs/reference/operators/visualization/basic/hierarchy-chart.md
+++ b/docs/reference/operators/visualization/basic/hierarchy-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Hierarchy Chart"
 description: "Visualize data in hierarchy"
diff --git a/docs/reference/operators/visualization/basic/icicle-chart.md b/docs/reference/operators/visualization/basic/icicle-chart.md
index d88f7a512d..e92fc6bcde 100644
--- a/docs/reference/operators/visualization/basic/icicle-chart.md
+++ b/docs/reference/operators/visualization/basic/icicle-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Icicle Chart"
 description: "Visualize hierarchical data from root to leaves"
diff --git a/docs/reference/operators/visualization/basic/line-chart.md b/docs/reference/operators/visualization/basic/line-chart.md
index e055fcb0bd..7d6b114500 100644
--- a/docs/reference/operators/visualization/basic/line-chart.md
+++ b/docs/reference/operators/visualization/basic/line-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Line Chart"
 description: "View the result in line chart"
diff --git a/docs/reference/operators/visualization/basic/pie-chart.md b/docs/reference/operators/visualization/basic/pie-chart.md
index ccded6fb48..0d48b5887a 100644
--- a/docs/reference/operators/visualization/basic/pie-chart.md
+++ b/docs/reference/operators/visualization/basic/pie-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Pie Chart"
 description: "Visualize data in a Pie Chart"
diff --git a/docs/reference/operators/visualization/basic/range-slider.md b/docs/reference/operators/visualization/basic/range-slider.md
index 7d7dfbf5fc..3b258a0980 100644
--- a/docs/reference/operators/visualization/basic/range-slider.md
+++ b/docs/reference/operators/visualization/basic/range-slider.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Range Slider"
 description: "Visualize data in a Range Slider"
diff --git a/docs/reference/operators/visualization/basic/sankey-diagram.md b/docs/reference/operators/visualization/basic/sankey-diagram.md
index 19b6083a82..4dfd198384 100644
--- a/docs/reference/operators/visualization/basic/sankey-diagram.md
+++ b/docs/reference/operators/visualization/basic/sankey-diagram.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Sankey Diagram"
 description: "Visualize data using a Sankey diagram"
diff --git a/docs/reference/operators/visualization/basic/scatter-plot.md b/docs/reference/operators/visualization/basic/scatter-plot.md
index 0ef740d564..de434386af 100644
--- a/docs/reference/operators/visualization/basic/scatter-plot.md
+++ b/docs/reference/operators/visualization/basic/scatter-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Scatter Plot"
 description: "View the result in a scatterplot"
diff --git a/docs/reference/operators/visualization/basic/tables-plot.md b/docs/reference/operators/visualization/basic/tables-plot.md
index 69e79c07fc..f4acb26a12 100644
--- a/docs/reference/operators/visualization/basic/tables-plot.md
+++ b/docs/reference/operators/visualization/basic/tables-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Tables Plot"
 description: "Visualize data in a table chart."
diff --git a/docs/reference/operators/visualization/basic/time-series-plot.md b/docs/reference/operators/visualization/basic/time-series-plot.md
index aeb158b916..64628760cf 100644
--- a/docs/reference/operators/visualization/basic/time-series-plot.md
+++ b/docs/reference/operators/visualization/basic/time-series-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Time Series Plot"
 description: "Visualize trends and patterns over time."
diff --git a/docs/reference/operators/visualization/financial/_index.md b/docs/reference/operators/visualization/financial/_index.md
index 71b305c409..05b2e5d1c4 100644
--- a/docs/reference/operators/visualization/financial/_index.md
+++ b/docs/reference/operators/visualization/financial/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Financial"
 description: "Operators in the Financial category"
diff --git a/docs/reference/operators/visualization/financial/bullet-chart.md b/docs/reference/operators/visualization/financial/bullet-chart.md
index 91da254183..c2a7d18daa 100644
--- a/docs/reference/operators/visualization/financial/bullet-chart.md
+++ b/docs/reference/operators/visualization/financial/bullet-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Bullet Chart"
 description: "Visualize data using a Bullet Chart that shows a primary quantitative bar and delta indicator. Optional elements such as qualitative ranges (steps) and a performance threshold are displayed only when provided."
diff --git a/docs/reference/operators/visualization/financial/candlestick-chart.md b/docs/reference/operators/visualization/financial/candlestick-chart.md
index ce0d1b3684..611ee530f3 100644
--- a/docs/reference/operators/visualization/financial/candlestick-chart.md
+++ b/docs/reference/operators/visualization/financial/candlestick-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Candlestick Chart"
 description: "Visualize data in a Candlestick Chart"
diff --git a/docs/reference/operators/visualization/financial/funnel-plot.md b/docs/reference/operators/visualization/financial/funnel-plot.md
index a14f3d6335..88d7a764ed 100644
--- a/docs/reference/operators/visualization/financial/funnel-plot.md
+++ b/docs/reference/operators/visualization/financial/funnel-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Funnel Plot"
 description: "Visualize data in a Funnel Plot"
diff --git a/docs/reference/operators/visualization/financial/gauge-chart.md b/docs/reference/operators/visualization/financial/gauge-chart.md
index 3b0738a7dc..fe48ef0be0 100644
--- a/docs/reference/operators/visualization/financial/gauge-chart.md
+++ b/docs/reference/operators/visualization/financial/gauge-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Gauge Chart"
 description: "Visualize a single value with a radial gauge chart, showing progress towards a goal with optional steps, threshold, and delta."
diff --git a/docs/reference/operators/visualization/financial/waterfall-chart.md b/docs/reference/operators/visualization/financial/waterfall-chart.md
index 11058cf616..19c82e008a 100644
--- a/docs/reference/operators/visualization/financial/waterfall-chart.md
+++ b/docs/reference/operators/visualization/financial/waterfall-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Waterfall Chart"
 description: "Visualize data as a waterfall chart"
diff --git a/docs/reference/operators/visualization/media/_index.md b/docs/reference/operators/visualization/media/_index.md
index 7ce5c3d4b9..c7576631aa 100644
--- a/docs/reference/operators/visualization/media/_index.md
+++ b/docs/reference/operators/visualization/media/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Media"
 description: "Operators in the Media category"
diff --git a/docs/reference/operators/visualization/media/html-visualizer.md b/docs/reference/operators/visualization/media/html-visualizer.md
index 085d990166..6060d1820a 100644
--- a/docs/reference/operators/visualization/media/html-visualizer.md
+++ b/docs/reference/operators/visualization/media/html-visualizer.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "HTML Visualizer"
 description: "Render the result of HTML content"
diff --git a/docs/reference/operators/visualization/media/image-visualizer.md b/docs/reference/operators/visualization/media/image-visualizer.md
index d0a35f6167..e91b3afbfd 100644
--- a/docs/reference/operators/visualization/media/image-visualizer.md
+++ b/docs/reference/operators/visualization/media/image-visualizer.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Image Visualizer"
 description: "Visualize image content"
diff --git a/docs/reference/operators/visualization/media/url-visualizer.md b/docs/reference/operators/visualization/media/url-visualizer.md
index 9d31db5cb5..b371e2ec4b 100644
--- a/docs/reference/operators/visualization/media/url-visualizer.md
+++ b/docs/reference/operators/visualization/media/url-visualizer.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "URL Visualizer"
 description: "Render the content of URL"
diff --git a/docs/reference/operators/visualization/media/word-cloud.md b/docs/reference/operators/visualization/media/word-cloud.md
index a6209a2ebe..382e430695 100644
--- a/docs/reference/operators/visualization/media/word-cloud.md
+++ b/docs/reference/operators/visualization/media/word-cloud.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Word Cloud"
 description: "Generate word cloud for texts"
diff --git a/docs/reference/operators/visualization/nested-table.md b/docs/reference/operators/visualization/nested-table.md
index 4be34ef5b8..16466b327a 100644
--- a/docs/reference/operators/visualization/nested-table.md
+++ b/docs/reference/operators/visualization/nested-table.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Nested Table"
 description: "Visualize Data in a Depth Two Nested Table"
diff --git a/docs/reference/operators/visualization/scientific/_index.md b/docs/reference/operators/visualization/scientific/_index.md
index 3e919d0ec6..21ad2354a5 100644
--- a/docs/reference/operators/visualization/scientific/_index.md
+++ b/docs/reference/operators/visualization/scientific/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Scientific"
 description: "Operators in the Scientific category"
diff --git a/docs/reference/operators/visualization/scientific/carpet-plot.md b/docs/reference/operators/visualization/scientific/carpet-plot.md
index 112257b8ad..2445c1e482 100644
--- a/docs/reference/operators/visualization/scientific/carpet-plot.md
+++ b/docs/reference/operators/visualization/scientific/carpet-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Carpet Plot"
 description: "Visualize data in a Carpet Plot"
diff --git a/docs/reference/operators/visualization/scientific/contour-plot.md b/docs/reference/operators/visualization/scientific/contour-plot.md
index e61f25b4fe..8958ab38e7 100644
--- a/docs/reference/operators/visualization/scientific/contour-plot.md
+++ b/docs/reference/operators/visualization/scientific/contour-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Contour Plot"
 description: "Displays terrain or gradient variations in a Contour Plot"
diff --git a/docs/reference/operators/visualization/scientific/dendrogram.md b/docs/reference/operators/visualization/scientific/dendrogram.md
index 93706fc1d4..eb5d35cffb 100644
--- a/docs/reference/operators/visualization/scientific/dendrogram.md
+++ b/docs/reference/operators/visualization/scientific/dendrogram.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Dendrogram"
 description: "Visualize data in a Dendrogram"
diff --git a/docs/reference/operators/visualization/scientific/heatmap.md b/docs/reference/operators/visualization/scientific/heatmap.md
index 5ef3b36e12..ba228bb42e 100644
--- a/docs/reference/operators/visualization/scientific/heatmap.md
+++ b/docs/reference/operators/visualization/scientific/heatmap.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Heatmap"
 description: "Visualize data in a HeatMap Chart"
diff --git a/docs/reference/operators/visualization/scientific/network-graph.md b/docs/reference/operators/visualization/scientific/network-graph.md
index 53dd58f6c2..ca261254ed 100644
--- a/docs/reference/operators/visualization/scientific/network-graph.md
+++ b/docs/reference/operators/visualization/scientific/network-graph.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Network Graph"
 description: "Visualize data in a network graph"
diff --git a/docs/reference/operators/visualization/scientific/parallel-coordinates-plot.md b/docs/reference/operators/visualization/scientific/parallel-coordinates-plot.md
index 2d530aefb1..b682af6b51 100644
--- a/docs/reference/operators/visualization/scientific/parallel-coordinates-plot.md
+++ b/docs/reference/operators/visualization/scientific/parallel-coordinates-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Parallel Coordinates Plot"
 description: "Visualize multivariate data using parallel coordinate axes"
diff --git a/docs/reference/operators/visualization/scientific/polar-chart.md b/docs/reference/operators/visualization/scientific/polar-chart.md
index 6bb4f425c2..235f67f821 100644
--- a/docs/reference/operators/visualization/scientific/polar-chart.md
+++ b/docs/reference/operators/visualization/scientific/polar-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Polar Chart"
 description: "Displays data points in a polar scatter plot"
diff --git a/docs/reference/operators/visualization/scientific/quiver-plot.md b/docs/reference/operators/visualization/scientific/quiver-plot.md
index 5de514364b..f928423f39 100644
--- a/docs/reference/operators/visualization/scientific/quiver-plot.md
+++ b/docs/reference/operators/visualization/scientific/quiver-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Quiver Plot"
 description: "Visualize vector data in a Quiver Plot"
diff --git a/docs/reference/operators/visualization/scientific/radar-chart.md b/docs/reference/operators/visualization/scientific/radar-chart.md
index 91dd5e768a..f6e848ac6d 100644
--- a/docs/reference/operators/visualization/scientific/radar-chart.md
+++ b/docs/reference/operators/visualization/scientific/radar-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Radar Chart"
 description: "Visualize data in a Radar Chart"
diff --git a/docs/reference/operators/visualization/scientific/radar-plot.md b/docs/reference/operators/visualization/scientific/radar-plot.md
index 5af5611521..5ed13696ab 100644
--- a/docs/reference/operators/visualization/scientific/radar-plot.md
+++ b/docs/reference/operators/visualization/scientific/radar-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Radar Plot"
 description: "View the result in a radar plot."
diff --git a/docs/reference/operators/visualization/scientific/ternary-contour.md b/docs/reference/operators/visualization/scientific/ternary-contour.md
index 83941759ba..3377247d20 100644
--- a/docs/reference/operators/visualization/scientific/ternary-contour.md
+++ b/docs/reference/operators/visualization/scientific/ternary-contour.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Ternary Contour"
 description: "Shows how a measured value changes across all mixtures of three components that sum to a constant"
diff --git a/docs/reference/operators/visualization/scientific/ternary-plot.md b/docs/reference/operators/visualization/scientific/ternary-plot.md
index b88bc2e3aa..e3a6102b35 100644
--- a/docs/reference/operators/visualization/scientific/ternary-plot.md
+++ b/docs/reference/operators/visualization/scientific/ternary-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Ternary Plot"
 description: "Points are graphed on a Ternary Plot using 3 specified data fields"
diff --git a/docs/reference/operators/visualization/scientific/volcano-plot.md b/docs/reference/operators/visualization/scientific/volcano-plot.md
index b92ee6fe70..969261134a 100644
--- a/docs/reference/operators/visualization/scientific/volcano-plot.md
+++ b/docs/reference/operators/visualization/scientific/volcano-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Volcano Plot"
 description: "Displays statistical significance versus effect size"
diff --git a/docs/reference/operators/visualization/scientific/wind-rose-chart.md b/docs/reference/operators/visualization/scientific/wind-rose-chart.md
index b26a78bd83..7766b082fc 100644
--- a/docs/reference/operators/visualization/scientific/wind-rose-chart.md
+++ b/docs/reference/operators/visualization/scientific/wind-rose-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Wind Rose Chart"
 description: "Displays wind distribution using a polar bar chart"
diff --git a/docs/reference/operators/visualization/statistical/_index.md b/docs/reference/operators/visualization/statistical/_index.md
index 4be17ce9f1..abf68ff8f2 100644
--- a/docs/reference/operators/visualization/statistical/_index.md
+++ b/docs/reference/operators/visualization/statistical/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Statistical"
 description: "Operators in the Statistical category"
diff --git a/docs/reference/operators/visualization/statistical/boxviolin-plot.md b/docs/reference/operators/visualization/statistical/boxviolin-plot.md
index ccd44b7d4f..d214acf6bf 100644
--- a/docs/reference/operators/visualization/statistical/boxviolin-plot.md
+++ b/docs/reference/operators/visualization/statistical/boxviolin-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Box/Violin Plot"
 description: "Visualize data using either a Box Plot or a Violin Plot. Box plots are drawn as a box with a vertical line down the middle which is mean value, and has horizontal lines attached to each side (known as “whiskers”). Violin plots provide more detail by showing a smoothed density curve on each side, and also include a box plot inside for comparison."
diff --git a/docs/reference/operators/visualization/statistical/continuous-error-bands.md b/docs/reference/operators/visualization/statistical/continuous-error-bands.md
index a2ea564161..07b568ed61 100644
--- a/docs/reference/operators/visualization/statistical/continuous-error-bands.md
+++ b/docs/reference/operators/visualization/statistical/continuous-error-bands.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Continuous Error Bands"
 description: "Visualize error or uncertainty along a continuous line"
diff --git a/docs/reference/operators/visualization/statistical/empirical-cumulative-distribution-plot.md b/docs/reference/operators/visualization/statistical/empirical-cumulative-distribution-plot.md
index b0b6ed0bc1..40366a9e3b 100644
--- a/docs/reference/operators/visualization/statistical/empirical-cumulative-distribution-plot.md
+++ b/docs/reference/operators/visualization/statistical/empirical-cumulative-distribution-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Empirical Cumulative Distribution Plot"
 description: "Visualize the empirical cumulative distribution of a numeric column."
diff --git a/docs/reference/operators/visualization/statistical/histogram.md b/docs/reference/operators/visualization/statistical/histogram.md
index 6cb75c28ac..6076d47046 100644
--- a/docs/reference/operators/visualization/statistical/histogram.md
+++ b/docs/reference/operators/visualization/statistical/histogram.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Histogram"
 description: "Visualize data in a Histogram Chart"
diff --git a/docs/reference/operators/visualization/statistical/histogram2d.md b/docs/reference/operators/visualization/statistical/histogram2d.md
index f8d84ebe53..cf7ee81881 100644
--- a/docs/reference/operators/visualization/statistical/histogram2d.md
+++ b/docs/reference/operators/visualization/statistical/histogram2d.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Histogram2D"
 description: "Displays a bivariate histogram as a density heatmap"
diff --git a/docs/reference/operators/visualization/statistical/scatter-matrix-chart.md b/docs/reference/operators/visualization/statistical/scatter-matrix-chart.md
index 890fb32bbe..89ffd76028 100644
--- a/docs/reference/operators/visualization/statistical/scatter-matrix-chart.md
+++ b/docs/reference/operators/visualization/statistical/scatter-matrix-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Scatter Matrix Chart"
 description: "Visualize datasets in a Scatter Matrix"
diff --git a/docs/reference/operators/visualization/statistical/strip-chart.md b/docs/reference/operators/visualization/statistical/strip-chart.md
index 53a9399fb8..bc9849bbbf 100644
--- a/docs/reference/operators/visualization/statistical/strip-chart.md
+++ b/docs/reference/operators/visualization/statistical/strip-chart.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Strip Chart"
 description: "Visualize distribution of data points as a strip plot"
diff --git a/docs/reference/operators/visualization/statistical/tree-plot.md b/docs/reference/operators/visualization/statistical/tree-plot.md
index 9a0831efa2..ec01824572 100644
--- a/docs/reference/operators/visualization/statistical/tree-plot.md
+++ b/docs/reference/operators/visualization/statistical/tree-plot.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Tree Plot"
 description: "Visualize hierarchical data as a top-down, interactive, auto-sizing tree"
diff --git a/docs/reference/project-structure.md b/docs/reference/project-structure.md
index 38897b0798..0269f72b6e 100644
--- a/docs/reference/project-structure.md
+++ b/docs/reference/project-structure.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Project Structure
 description: In-depth technical and configuration references for Texera’s components and environment.
diff --git a/docs/reference/storage.md b/docs/reference/storage.md
index bdb61dbeb6..347a0417f3 100644
--- a/docs/reference/storage.md
+++ b/docs/reference/storage.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Storage
 description: In-depth technical and configuration references for Texera’s components and environment.
diff --git a/docs/security/_index.md b/docs/security/_index.md
index 7561b61278..23983204b4 100644
--- a/docs/security/_index.md
+++ b/docs/security/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Security
 description: Comprehensive guide to Texera's security model, user roles, access control, and vulnerability reporting
diff --git a/docs/tutorials/_index.md b/docs/tutorials/_index.md
index d812fd1e37..968fcf604e 100644
--- a/docs/tutorials/_index.md
+++ b/docs/tutorials/_index.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: Tutorials
 description: Step-by-step guides for building workflows and applications with Texera.
diff --git a/docs/tutorials/create-dataset-upload-data.md b/docs/tutorials/create-dataset-upload-data.md
index 743aa82cc1..0e7237a67f 100644
--- a/docs/tutorials/create-dataset-upload-data.md
+++ b/docs/tutorials/create-dataset-upload-data.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Create Dataset, upload data to it and use it in Workflow"
 weight: 20
diff --git a/docs/tutorials/guide-for-how-to-use-texera.md b/docs/tutorials/guide-for-how-to-use-texera.md
index ce77759da9..f41967a80b 100644
--- a/docs/tutorials/guide-for-how-to-use-texera.md
+++ b/docs/tutorials/guide-for-how-to-use-texera.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide for how to use Texera"
 weight: 10
diff --git a/docs/tutorials/guide-to-enable-llm-agent.md b/docs/tutorials/guide-to-enable-llm-agent.md
index 48341d370f..d44f45c99e 100644
--- a/docs/tutorials/guide-to-enable-llm-agent.md
+++ b/docs/tutorials/guide-to-enable-llm-agent.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide to enable the LLM‐based Texera agent"
 weight: 40
diff --git a/docs/tutorials/guide-to-use-python-udf.md b/docs/tutorials/guide-to-use-python-udf.md
index e9de246c8c..b02c1a78da 100644
--- a/docs/tutorials/guide-to-use-python-udf.md
+++ b/docs/tutorials/guide-to-use-python-udf.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Guide to Use a Python UDF"
 weight: 30
diff --git a/docs/tutorials/migrate-jupyter-notebook.md b/docs/tutorials/migrate-jupyter-notebook.md
index 5635270414..15ac7c46a5 100644
--- a/docs/tutorials/migrate-jupyter-notebook.md
+++ b/docs/tutorials/migrate-jupyter-notebook.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 ---
 title: "Migrate a Jupyter Notebook to a Texera Workflow"
 weight: 60
diff --git a/frontend/AGENTS.md b/frontend/AGENTS.md
index a560b6a982..e8a5fab964 100644
--- a/frontend/AGENTS.md
+++ b/frontend/AGENTS.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # AGENTS.md — frontend
 
 Scoped agent rules for `frontend/`. Loaded automatically on top of the repo-root [`AGENTS.md`](../AGENTS.md).
diff --git a/frontend/README.md b/frontend/README.md
index 1320038103..8fd8e9378d 100644
--- a/frontend/README.md
+++ b/frontend/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # Texera Angular UI
 
 The web UI for [Apache Texera](https://github.com/apache/texera). An Angular single-page app that talks to the JVM backend services (`amber`, `access-control-service`, `file-service`, …) and to the agent service.
diff --git a/frontend/TESTING.md b/frontend/TESTING.md
index da28d41e1f..7372fc4b29 100644
--- a/frontend/TESTING.md
+++ b/frontend/TESTING.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 # Frontend testing guide
 
 Canonical reference for writing, running, and maintaining unit tests in `frontend/`. Written for both human contributors and AI agents — read it on demand when [`AGENTS.md`](AGENTS.md)'s rules need a deeper recipe, the mental model behind a constraint, or troubleshooting steps.
diff --git a/pyright-language-service/README.md b/pyright-language-service/README.md
index d180061557..22ed48f45f 100644
--- a/pyright-language-service/README.md
+++ b/pyright-language-service/README.md
@@ -1,3 +1,22 @@
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+-->
+
 This folder is for the Pyright language server. 
 
 The documents in src which use to start the Pyright language server is done by Typefox, you can refer to "https://github.com/TypeFox/monaco-languageclient/tree/main/packages/examples/src/python"
\ No newline at end of file