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https://issues.apache.org/jira/browse/PDFBOX-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056300#comment-15056300
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Tilman Hausherr commented on PDFBOX-3114:
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test1_p1p2_visualsigned_COSWriterCOSArrayModified_OK.pdf shows a PDF with 2
visible signature that is OK.
The first problem is the one that was mentioned by [~mkl] last year. This can
be fixed by eliminating some optimizations (rather, not do them when
incremental update) that transform indirect objects into direct objects.
After that was done, Adobe Reader wasn't satisfied, and I noticed that object
58 (colorspace CS0) was updated. I then tried a dirty hack just to exclude
object 58 to see what would happen - and Adobe Reader was satisfied. So that
was really the problem. Surprisingly, the object 60 (font TT0) from the same
resource dictionary was not updated. The only difference between the two is
that CS0 is an array and TT0 is a dictionary. Solution: make COSArray
updatable. Now Adobe Reader was satisfied.
I suspect that in the long term, we must make every COSObject updateable again,
revert most of PDFBOX-2685, and change COSWriter so that unusual structures are
preserved (example: even an indirect NULL should be preserved!). But I won't do
anything without a test case.
I'll also commit the changes about the invisible signatures, the annotations
and the appearance streams are not needed.
[~v.koroghlishvili], [~tchojecki] please test whether your signing applications
work properly with the 2.0 trunk.
> Visible signatures in different pages changes previous revision
> ---------------------------------------------------------------
>
> 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-3114-screenshot.png, pdfbox-2.0.0-RC1_issue.zip,
> test1_invisiblysigned_COSWriterModified_p1p2_ERR.pdf,
> test1_invisiblysignednoannotations_p1p2.pdf,
> test1_p1p2_visualsigned_COSWriterCOSArrayModified_OK.pdf,
> 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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