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https://issues.apache.org/jira/browse/PDFBOX-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395706#comment-16395706
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Martin Mancuska commented on PDFBOX-4146:
-----------------------------------------
You're welcome [~tilman]. Thanks for link, but for signing we use DSS
([https://github.com/esig/dss)] and it uses PDFBox as backend.
> Patch: Fix for appearance of visible signature
> ----------------------------------------------
>
> Key: PDFBOX-4146
> URL: https://issues.apache.org/jira/browse/PDFBOX-4146
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.8
> Reporter: Martin Mancuska
> Assignee: Tilman Hausherr
> Priority: Minor
> Labels: Signature, patch
> Fix For: 2.0.9, 3.0.0 PDFBox
>
> Attachments: visible_signature.patch
>
>
> We're using PDFBox (as backend used by Esig DSS) for digital signing of
> documents. We've found out that visible signature has different look on Mac
> Preview app than other PDF viewers. After some investigation we suspect that
> BBox-es for appearance of signature is not filled correctly by PDFBox. The
> values are hard coded as [0, 0, 100, 50]. Also transformation matrix for
> translating from form XObject coordinate system into default one has value
> (1, 0, 0, 1, 0, 0) -> no scaling between default user coordinate system and
> form XObject coordinate system.
> Therefore I think that the Mac Preview App draws signature with dimensions
> 100x50 because no transformation were done.
> I've attached patch which solves this issue for us. The signature is shown
> correctly in all PDF viewers now. Maybe you can take a look on it and
> integrate it into your code base, or propose better solution.
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