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https://issues.apache.org/jira/browse/PDFBOX-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386344#comment-14386344
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Michael Klink commented on PDFBOX-2729:
---------------------------------------
After some debugging it looks to me like the PDFBox signing code has not been
developed or tested for encrypted files.
Here {{StandardSecurityHandler}} is initialized when the original file is
parsed. In this context the default constructor is used. This default
constructor implicitly sets {{policy}} to {{null}}.
When writing the file, though, some {{StandardSecurityHandler}} methods are
called which require a nun-{{null}} value of {{policy}}.
> Can't sign encrypted PDF files
> ------------------------------
>
> Key: PDFBOX-2729
> URL: https://issues.apache.org/jira/browse/PDFBOX-2729
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.0
> Reporter: Cyril Bremaud
> Assignee: Andreas Lehmkühler
>
> It is not possible to sign an encrypted PDF document.
> More details here :
> [http://stackoverflow.com/questions/29232684/signing-an-encrypted-pdf-document-with-pdfbox-2-0-0]
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