[jira] [Commented] (PDFBOX-5182) Detect whether a Signature is out of Date

["Tilman Hausherr (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337544#comment-17337544 ] 

Tilman Hausherr commented on PDFBOX-5182:
-----------------------------------------

This is possible with the ShowSignature.java example in the source code download. Did you try that one?

> Detect whether a Signature is out of Date
> -----------------------------------------
>
>                 Key: PDFBOX-5182
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5182
>             Project: PDFBox
>          Issue Type: New Feature
>            Reporter: Ranjeet Kuruvilla
>            Priority: Major
>
> Acrobat can detect, if a Signature is invalid. In particular one can see, if a Signature is outdated. That can happen, when a person signs a Document and then changes a Textfield or a Checkbox or any other field.
>  
> It would be great, if one could detect, whether one could use PDFBox to detect whether a Signature has been invalidated.
>  
> I attached the sign one can see in Acrobat once a Signature is invalidated !Invalid Signature.png!
> .
>  



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