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https://issues.apache.org/jira/browse/PDFBOX-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200704#comment-14200704
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John Hewson commented on PDFBOX-2001:
-------------------------------------
Yes, get the same with OS X Preview and Foxit. Acrobat displays some extra
information saying that the validity of the signature is unknown, but we don't
support that (and neither do most readers).
> Digital Signature information (parser bug?)
> -------------------------------------------
>
> Key: PDFBOX-2001
> URL: https://issues.apache.org/jira/browse/PDFBOX-2001
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 1.8.3
> Reporter: Nicolas Kaczmarski
> Assignee: Andreas Lehmkühler
> Attachments: D.1_signiert.pdf, PDFBOX2001-D.1_signiert1.png,
> acrobatSignatureExample.PNG
>
>
> We have a signed PDF but signature is described without key "Sig".
> As you can see in the standard PDF 32000-1:2008 - Table 252 - Entries in a
> signature dictionary, this key is optional :
> "(Optional) The type of PDF object that this dictionary describes; if
> present, shall be Sig for a signature dictionary. "
> But PDFBox seems to limit its research of signature only if this key "Sig" is
> present.
> What is your position about that?
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