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https://issues.apache.org/jira/browse/PDFBOX-3336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269143#comment-15269143
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Tilman Hausherr commented on PDFBOX-3336:
-----------------------------------------

Is your signature interface the sample code from PDFBox, or is it your own?

The file append_by_pdf_box_no_signature.txt does have an acroform, but I don't 
see the field, although I see the XObjects belonging to it.

Are you possibly having several versions of PDFBox in your classpath?

However... I tried to sign your file and it doesn't work properly, i.e. Adobe 
Reader does not display the signature although it should.



> several errors in the incremental save
> --------------------------------------
>
>                 Key: PDFBOX-3336
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3336
>             Project: PDFBox
>          Issue Type: Bug
>          Components: AcroForm
>    Affects Versions: 2.0.1
>         Environment: JDK8
>            Reporter: Marco Monacelli
>            Priority: Blocker
>         Attachments: append_by_pdf_box_no_signature.txt, document_type_2.pdf
>
>
> We have several mistakes in pdf signature.
> 1) Some PDF ar not signed but no error is arised 
> 2) Others contain the signature but acrobat reader does not show it .
> The documents of the first type are confidential and we can only provide the 
> information appendend by pdfbox to the original PDF. 
> For the second case we will provide you the original document .



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