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https://issues.apache.org/jira/browse/PDFBOX-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056382#comment-15056382
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Tilman Hausherr commented on PDFBOX-3114:
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The change for 1.8 was easier, because the COSArray change wasn't needed. I
also didn't do the change for invisible signatures as this is just
optimization. The example was adjusted in PDFBOX-2812.
> 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: 1.8.10, 1.8.11, 2.0.0
> Environment: Compiled with jdk1.8.0_60, tested with Adobe Acrobat XI
> Pro v.11.0.13
> Reporter: Luca Battistelli
> Assignee: Tilman Hausherr
> Priority: Blocker
> Fix For: 1.8.11, 2.0.0
>
> 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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