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https://issues.apache.org/jira/browse/PDFBOX-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893989#comment-16893989
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Tilman Hausherr commented on PDFBOX-4609:
-----------------------------------------
There can be so many reasons. If you can't share the file, then sign a public
file.
> At least one signature is invalid
> ----------------------------------
>
> Key: PDFBOX-4609
> URL: https://issues.apache.org/jira/browse/PDFBOX-4609
> Project: PDFBox
> Issue Type: Wish
> Components: .NET
> Affects Versions: 1.8.15
> Reporter: bal
> Priority: Major
>
> I am getting signature is invalid error in the signature panel of pdf after
> pkcs 7 signature insertion. I can see the name of the signer with the signed
> by in signature panel. I am not able to find out disallowed changes pdfbox
> does resulting into invalid pdf by acrobat reader. Is it possible to
> validate the pdf with pdfbox? Thanks in advance.
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