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https://issues.apache.org/jira/browse/PDFBOX-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14618525#comment-14618525
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Petras commented on PDFBOX-2720:
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It appears that incremental update of PDF with cross-reference stream does not
include *Prev* entry into the cross-reference stream dictionary. See the method
COSWriter#doWriteXRefInc#622 which removes it:
{{trailer.removeItem(COSName.PREV);}}
but do not updates it with the value of *startxref* keyword from the previous
document revision.
It start to work if I replace it with:
{{trailer.setLong(COSName.PREV, doc.getStartXref());}}
> Can't sign PDF document with forms or annotations
> -------------------------------------------------
>
> Key: PDFBOX-2720
> URL: https://issues.apache.org/jira/browse/PDFBOX-2720
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.0
> Reporter: Cyril Bremaud
> Assignee: Andreas Lehmkühler
> Priority: Blocker
> Attachments: Doc1WithSignForms.pdf, Doc1WithSignForms.pdf_signed.pdf,
> Doc2.pdf, Doc2.pdf_signed.pdf, Doc3WithAnnot.pdf,
> Doc3WithAnnot.pdf_signed.pdf, Doc3WithoutAnnot.pdf,
> Doc3WithoutAnnot.pdf_signed.pdf
>
>
> It is not possible to sign a PDF document which contains a form.
> There is no exception traces.
> Please find attached 8 documents :
> * A document with a visual signature form (does not work) (Doc1)
> * A probably latex generated document (does not work) (Doc2)
> * A document with an annotation (does not work) (Doc3WithAnnot)
> * And the same document without annotation ( which works well )
> (Doc3WithoutAnnot)
> * And their signed release.
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