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https://issues.apache.org/jira/browse/PDFBOX-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16709896#comment-16709896
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Martin Klíma commented on PDFBOX-4393:
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Hi Tilman, thanks for the answer and quick response!
So basically the problem is that the PDF file is missing Adobe Reader metadata,
am I right? I will check if other software like FoxitReader will accept this as
valid but in the mean time, is there any possibility how to make it work for
Adobe Reader?
Sadly I don't have acces to Adobe Reader support but most of the clients use
this software as default PDF reader.
Maybe use some tool to include correct Metadata. I am not expert on this, are
the Metadata static? Or they change with content of PDF? If they would be
static, it would be probably possible to append them to PDF otherwise it would
be necessary to somehow automatically open and save the PDF in Adobe Reader to
have them correctly formatted in PDF.
> PDF signature invalid after second interactive field signed
> -----------------------------------------------------------
>
> Key: PDFBOX-4393
> URL: https://issues.apache.org/jira/browse/PDFBOX-4393
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.12
> Environment: Windows
> Reporter: Martin Klíma
> Priority: Major
> Attachments: image-2018-12-04-11-14-01-586.png,
> image-2018-12-04-11-14-32-676.png, streamserve_test_sig0.pdf,
> streamserve_test_sig0_saved.pdf, streamserve_test_sig0_saved_signed by
> PDFBox.pdf, streamserve_test_sig0_saved_signed by PDFBox_then_signed by
> AR.pdf, streamserve_test_sig2.pdf, streamserve_test_sig3.pdf,
> streamserve_test_sig3.signed.pdf
>
>
> Hi guys,
> I stumped on the problem with PDFBox and interactive field signing. I have
> PDF generated with OpenText StreamServe with two interactive fields for
> signing. See example 1 (streamserve_test_sig0.pdf) in attachement.
> When I use Adobe Reader I can sign both of the visual fields just fine but
> when I use PDFBox to sign one of this field the following signature is marked
> as invalid. Doesn't matter if I use PDFbox or sign it manually with Adobe
> Reader See example 3:
> * streamserve_test_sig3.pdf (signed by PDFBox) - valid
> * streamserve_test_sig3.signed.pdf (signed 2nd by Adobe Reader) - invalid
> !image-2018-12-04-11-14-01-586.png|width=582,height=269!
>
> Also last example - when it´s signed first by Adobe Reader and then with
> PDFBox the signature seems valid but it says the document was "certified".
> See example 2 (streamserve_test_sig2.pdf)
> !image-2018-12-04-11-14-32-676.png|width=591,height=283!
>
> What could be wrong? When is signed whole document with PDFBox it works just
> fine.
> Thanks for response,
> Martin
>
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