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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4225) Print PDF with Digital Signature
Date Sun, 20 May 2018 08:46:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16481871#comment-16481871
] 

Tilman Hausherr commented on PDFBOX-4225:
-----------------------------------------

Please attach your PDF. There is no requirement to validate a signature when printing. See
also p 8:

[https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PPKAppearances.pdf]

{quote}
Prior to Acrobat 6.0, signature appearances were manipulated at run-time in order to display
the validity of the signature. The validity was shown as a graphic icon and with an additional,
optional text message. The manipulated portions of the signature appearance were contained
in layers n1, n3 and n4. Beginning with version 6, Acrobat does not maintain support for signature
appearances that can be manipulated, though legacy signatures with these appearances may continue
to display correctly. Use of layers n1, n3, and n4 is not recommended.
{quote}

There is  some very basic signature validation in the ShowSignature example in the source
code download.

> Print PDF with Digital Signature
> --------------------------------
>
>                 Key: PDFBOX-4225
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4225
>             Project: PDFBox
>          Issue Type: Bug
>            Reporter: Akshay Sharma
>            Priority: Major
>
> When printing the document which is digitally signed signature is not validated and on
the printed document it displays the question mark.



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