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Posted to fop-users@xmlgraphics.apache.org by Peter Coppens <pc...@gmail.com> on 2009/01/28 23:31:54 UTC

FOP Encrypted files can not be opened with Mac's Preview?

Fop fans,

We are currently using, on customer request, fop¹s encryption features to
disallow e.g. copying of text.

Works fine when the pdf is opened in Acrobat but does not work in MacOs¹s
Preview (10.5.something)

The only thing I can think of is that Preview might have dropped 40bit RC4
support for opening PDF¹s. A security updated was provided ( CVE-2008-0994 -
http://support.apple.com/kb/HT1249) where Apple seems to have removed 40bit
RC4 support for encrypting PDF¹s. Nothing is mentioned about opening though.

Anyway, I guess this is more of a MacOS question, but perhaps some fop-users
reader ran into this earlier...hence my question on this list.

Thanks,

Peter

Re: FOP Encrypted files can not be opened with Mac's Preview?

Posted by Peter Coppens <pc...@gmail.com>.
> One tiny remark: is it deliberate that you specify the "-u" parameter
> without specifying a password, or is this a typo?
> If I do that here, the print and copy restrictions are applied, but no
> password is asked when opening the file. It has the same effect as
> omitting the '-u' parameter.
The idea is people can open the pdf without any password but can not e.g.
copy text from it.

> If I judge correctly, the change I committed (which Jeremias mentioned
> as a fix in Bugzilla 40557) could have something to do with it. Before
> that change, FOP generated two "/ID" entries in the trailer in case
> the document was encrypted, and this caused problems in earlier
> versions of Acrobat too...
> 
> Can you confirm that the issue does not occur with FOP Trunk?
It does. Wonderful!
> 
> 
> Cheers
> 
> Andreas

Many thanks indeed!
Peter



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Re: FOP Encrypted files can not be opened with Mac's Preview?

Posted by Andreas Delmelle <an...@telenet.be>.
On 29 Jan 2009, at 00:48, Peter Coppens wrote:

Hi Peter

> Kind of you to take the time to try this.
>
> I am on Preview Version 4.1 (469.4) on MacOs 10.5.6

Same here.

> FO is as simple as it gets I think
>
> Attached the pdf with fop 0.95...if it makes it through the list  
> server.
> Rendered it with
> fop -u -noprint -nocopy -fo t2.fo -pdf t2.pdf

One tiny remark: is it deliberate that you specify the "-u" parameter  
without specifying a password, or is this a typo?
If I do that here, the print and copy restrictions are applied, but no  
password is asked when opening the file. It has the same effect as  
omitting the '-u' parameter.

Note: if you don't specify an owner password '-o password', then FOP  
generates a random one, so it will become rather difficult to get  
around those restrictions. :-)

> It opens in Acrobat reader without further ado, but I get the  
> password input
> screen of Preview

Same here with your PDF. I notice you are using FOP 0.95.
I think the news is good, since I must admit, I only tried FOP Trunk.

If I judge correctly, the change I committed (which Jeremias mentioned  
as a fix in Bugzilla 40557) could have something to do with it. Before  
that change, FOP generated two "/ID" entries in the trailer in case  
the document was encrypted, and this caused problems in earlier  
versions of Acrobat too...

Can you confirm that the issue does not occur with FOP Trunk?


Cheers

Andreas

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Re: FOP Encrypted files can not be opened with Mac's Preview?

Posted by Peter Coppens <pc...@gmail.com>.
Andreas,

Kind of you to take the time to try this.

I am on Preview Version 4.1 (469.4) on MacOs 10.5.6

FO is as simple as it gets I think

<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
      <fo:simple-page-master master-name="pm" page-height="25cm"
                    page-width="20cm" margin-top="1cm"
                    margin-bottom="1cm" margin-left="1.5cm"
margin-right="1.5cm">
        <fo:region-body/>
      </fo:simple-page-master>
  </fo:layout-master-set>

  <fo:page-sequence master-reference="pm">
      <fo:flow flow-name="xsl-region-body">
        <fo:block-container absolute-position="fixed" top="4cm" left="4cm" >
          <fo:block >
            <fo:inline>This is text</fo:inline>
          </fo:block>
        </fo:block-container>
    </fo:flow>
  </fo:page-sequence>
</fo:root>


Attached the pdf with fop 0.95...if it makes it through the list server.
Rendered it with 
 fop -u -noprint -nocopy -fo t2.fo -pdf t2.pdf


It opens in Acrobat reader without further ado, but I get the password input
screen of Preview

Adding a password makes Acrobat ask for it and then open the file. Preview
refuses to open it even if the password is entered.

Thanks!

peter

> From: Andreas Delmelle <an...@telenet.be>
> Reply-To: <fo...@xmlgraphics.apache.org>
> Date: Thu, 29 Jan 2009 00:12:23 +0100
> To: <fo...@xmlgraphics.apache.org>
> Subject: Re: FOP Encrypted files can not be opened with Mac's Preview?
> 
> On 28 Jan 2009, at 23:31, Peter Coppens wrote:
> 
> Hi Peter
> 
>> We are currently using, on customer request, fop�s encryption
>> features to disallow e.g. copying of text.
>> 
>> Works fine when the pdf is opened in Acrobat but does not work in
>> MacOs�s Preview (10.5.something)
> 
> I cannot immediately reproduce that over here (10.5.6) with a
> relatively simple FO producing a single page. Tested "-noprint -nocopy
> -u test", and encountered no issues opening the file in Preview.
> 
> Anything special about the FO and/or PDF that could be causing this?
> 
> 
> Andreas
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: fop-users-unsubscribe@xmlgraphics.apache.org
> For additional commands, e-mail: fop-users-help@xmlgraphics.apache.org
>

Re: FOP Encrypted files can not be opened with Mac's Preview?

Posted by Andreas Delmelle <an...@telenet.be>.
On 28 Jan 2009, at 23:31, Peter Coppens wrote:

Hi Peter

> We are currently using, on customer request, fop’s encryption  
> features to disallow e.g. copying of text.
>
> Works fine when the pdf is opened in Acrobat but does not work in  
> MacOs’s Preview (10.5.something)

I cannot immediately reproduce that over here (10.5.6) with a  
relatively simple FO producing a single page. Tested "-noprint -nocopy  
-u test", and encountered no issues opening the file in Preview.

Anything special about the FO and/or PDF that could be causing this?


Andreas
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