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https://issues.apache.org/jira/browse/PDFBOX-3631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15750872#comment-15750872
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Marco Monacelli commented on PDFBOX-3631:
-----------------------------------------

The problem starts from the input file. Input file generated by the same 
procedure and signed with PDFBox produce sometimes other invisible visible 
signatures. In the attached PDF file if signed produces visible signatures and 
a PDF file that if signed produces invisible signatures.

https://drive.google.com/file/d/0B-qB8oXqKgqSQmtKVWtxUzE0SjA/view?usp=sharing

If sign the file with acrobat is always visible.


> Signature Interoperability Issue
> --------------------------------
>
>                 Key: PDFBOX-3631
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3631
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Signing
>    Affects Versions: 2.0.3
>         Environment: Java 1.8 Windows.
>            Reporter: Marco Monacelli
>            Priority: Minor
>         Attachments: PDFBOX-3631.zip, PDFJS-4743-signature.pdf
>
>
> Some files if signed with PDFBox produce not visible signature in chrome, 
> pdfium foxit. 
> If the same file is signed on some Actobat, Foxit or itext the signature is 
> visible.
> The test fle are inserted in an encrypted zip. If possible I would like to 
> communicate the password with a private message.



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