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From Martin Klíma (JIRA) <j...@apache.org>
Subject [jira] [Created] (PDFBOX-4393) PDF signature invalid after second interactive field signed
Date Tue, 04 Dec 2018 10:16:00 GMT
Martin Klíma created PDFBOX-4393:

             Summary: 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
    Affects Versions: 2.0.12
         Environment: Windows
            Reporter: Martin Klíma
         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_sig2.pdf, streamserve_test_sig3.pdf, streamserve_test_sig3.signed.pdf

Hi guys,

I stumpted 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.pdg)
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.pdf (signed 2nd by Adobe Reader) - invalid



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)



What could be wrong? When is signed whole document with PDFBox it works just fine. 

Thanks for response,












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