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https://issues.apache.org/jira/browse/PDFBOX-4609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893965#comment-16893965
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bal commented on PDFBOX-4609:
-----------------------------

I can't attach pdf due to security concerns. I couldn't find out why my 
signature is getting invalid. Why the document has been altered or modified 
since signature is applied is is seen at the signature panel of pdf. Tried but 
not succeed  to find out why acrobat invalidates the pdf.?  Please help. 

> 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, Utilities
>    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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