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