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https://issues.apache.org/jira/browse/PDFBOX-4261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536109#comment-16536109
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Tilman Hausherr commented on PDFBOX-4261:
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Sorry, I meant 1.5.
I did a test yesterday, I ran animal sniffer with setting for 1.5 and it did
show many errors, but many of the same kind. It would be hours of work, but not
very difficult.
> Invalidated signature signing pdf twice
> ----------------------------------------
>
> Key: PDFBOX-4261
> URL: https://issues.apache.org/jira/browse/PDFBOX-4261
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 1.8.15
> Reporter: Claudio Tortorelli
> Priority: Major
> Attachments: issue_data.zip
>
>
> A customer sent us a pdf that has this problem: when it is signed twice by
> *pdfbox 1.8.x* the second signature invalidates the first one.
> If we apply the same procedure using *pdfbox 2.0.x* the problem doesn't
> occur, but the customer required java 1.5 so we can't switch to the new
> version in this case.
> For +privacy purposes+ we had anonymized the original PDF file by editing 3
> stream inside the pdf, without altering the original structure. So the file
> "92752146_noSign_anonymous.pdf" you can find in attachement has not the
> original text/image streams, but reproduces the problem as the original one.
> Thank you in advance
>
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