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https://issues.apache.org/jira/browse/PDFBOX-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr updated PDFBOX-3114:
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Attachment: test1_signedinvisible_p2.pdf
Could you do me another favor? Please sign an invisible signature on the
attached file (test1_signedinvisible_p2.pdf) on page 1 with Acrobat.
With PDFBox, invisible signatures are also attached to a page. I don't know how
acrobat does it. The new file should have less changes, so hopefully it should
be easier to find some clue what's wrong.
I did find out something today, the error does not happen if the (invisible)
annotation on the page of the second signature is omitted. From my
understanding of the spec, the (invisible) annotation is not needed for
invisible signatures at all. But of course it is needed for visible signatures.
To me, this (and the viewer error msg "one page was modified") suggests that
Adobe Reader believes that one page of the (signed) file was modified, but I
haven't found out why.
> Visible signatures in different pages
> -------------------------------------
>
> Key: PDFBOX-3114
> URL: https://issues.apache.org/jira/browse/PDFBOX-3114
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.0
> Environment: Compiled with jdk1.8.0_60, tested with Adobe Acrobat XI
> Pro v.11.0.13
> Reporter: Luca Battistelli
> Priority: Blocker
> Attachments: pdfbox-2.0.0-RC1_issue.zip,
> test1_signedinvisible_p2.pdf, test_Acrobat_iText.zip
>
>
> I tried to make two visible signatures in a 2-pages pdf file using
> pdfbox-2.0.0-RC1.
> I followed the example in SVN directory
> https://svn.apache.org/viewvc/pdfbox/trunk/examples/src/main/java/org/apache/pdfbox/examples/signature/
> I have just modified CreateVisibleSignature class customizing the input
> parameters and the page to sign.
> If both the signatures are made in the same page, no error occurs. If
> signatures are made in different pages (e.g. signature 1 in page 1 and
> signature 2 in page 2), when I open the pdf file with Adobe Acrobat XI Pro
> (v.11.0.13) it tells that signature 1 is not valid.
> The attachment below refers to the source/resourse zip file. It contains:
> - test.docx: 2-pages test document generated with Microsoft Office
> Professional Plus 2013
> - test1.pdf: pdf version that generates error (created with Word by selecting
> "Save as Adobe PDF" option)
> - test1_*.pdf: signed pdf files with error
> - test2.pdf: pdf version that generates no error (created with Word by
> selecting "Save as" option and then "*.PDF")
> - test2_*.pdf: signed pdf files with no error
> - CreateVisibleSignature.java: customized source code
> - stamp.png: signature image
> - test.p12: key store (password 12345)
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