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Commenting and Digitally Sign

Jul 10, 2012 6:11 AM

Categories: Windows, Macintosh Tags: #digital_signature #incremental_updates

Dear Adobe Acrobat Team, I am adding an annotation and a digital signature to a pdf document through my being-developed application, however when open that pdf with adobe acrobat, it validates the signature, and reports that "Annotations Modified" under the validated signature in the signatures panel, so why do acrobat behaves that way?

1457 Views   14 Replies   Latest reply: kjumaa, Jul 23, 2012 8:59 AM
 
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  • LoriAUC
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    1. LoriAUC,
    Jul 10, 2012 6:31 AM   in reply to kjumaa
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    Moving this discussion to the Acrobat SDK forum.

     
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  • kjumaa
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    2. kjumaa,
    Jul 17, 2012 6:28 AM   in reply to kjumaa
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    Any helpful replies?

     
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  • lrosenth
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    3. lrosenth,
    Jul 17, 2012 12:14 PM   in reply to kjumaa
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    Without an example PDF that demonstrates the problem we can only guess…

     

    And my crystal ball is on the fritz this week ☹

     
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  • kjumaa
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    4. kjumaa,
    Jul 18, 2012 3:22 AM   in reply to lrosenth
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    So sorry, you can download the pdf sample file from the link

     

    http://ge.tt/4ntQWfK/v/0

     

    named sample.pdf

     

    Thank you very much.

     
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  • lrosenth
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    5. lrosenth,
    Jul 18, 2012 3:44 AM   in reply to kjumaa
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    You did a standard signature and then commented.   You need to do a CERTIFYING signature with stipulate that commenting rights are enabled.

     
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  • kjumaa
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    6. kjumaa,
    Jul 18, 2012 4:05 AM   in reply to lrosenth
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    Thanks lrosenth,

     

    But I am adding the comment, before adding the signature; the signature covers the whole document including the comment?

     
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  • lrosenth
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    7. lrosenth,
    Jul 18, 2012 4:34 AM   in reply to kjumaa
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    I see the comment in the same update table as the signature, correct?

     
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  • kjumaa
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    8. kjumaa,
    Jul 18, 2012 5:37 AM   in reply to lrosenth
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    Yes lrosenth, that's true, but even with document that has the comment in in an update table ( in an incremental update section ) before

    the the incremental update of the digital signature, the same probelm appears?

     

    Can you please have a look at an example of such document at:

     

    http://ge.tt/4nOkpfK/v/0

     

    Thank you.

     
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  • kjumaa
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    9. kjumaa,
    Jul 21, 2012 2:45 AM   in reply to kjumaa
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    Hello lrosenth,

     

    Did you have a look on sample2.pdf?

     

    Thank you.

     
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  • kjumaa
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    10. kjumaa,
    Jul 22, 2012 2:47 AM   in reply to kjumaa
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    Hello,

     

    Can anybody help ?

     
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  • lrosenth
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    11. lrosenth,
    Jul 22, 2012 4:59 AM   in reply to kjumaa
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    Are you sure your signature is trusted by Acrobat?  You will also see warnings when you use a self-signed signature but don’t add it to the trust store.

     
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  • kjumaa
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    12. kjumaa,
    Jul 22, 2012 5:21 AM   in reply to lrosenth
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    Hello lrosenth,

     

    No, the certificate is trusted and it is in the store of trusted certificate; Adobe is validating the signature and it says it is valid.

    So the problem is related to how adobe verifies that no updates were applied to the document after the signature is applied;

    depending on signautre timestamp, annotation creation time, document metadata, ... etc.

     

    Thank you very much.

     

     
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  • lrosenth
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    13. lrosenth,
    Jul 22, 2012 9:49 AM   in reply to kjumaa
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    I am still seeing that the signature in Sample2 only applies to the original and NOT to do the annotated version. You can see this because Acrobat clearly allows you to pull the original version, which does NOT have the signature.

     
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  • kjumaa
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    14. kjumaa,
    Jul 23, 2012 8:59 AM   in reply to lrosenth
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    Yes lrosenth, you are right, but how to tell Acrobat that the annotation is part of the signed version, as the signature covers the whole document?

     

    Thank you.

     
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