Martin Mancuska commented on PDFBOX-4146:

Thanks for info. IMHO this patch affects only annotations for visible digital 
signatures. Appearances of other signatures remain untouched.

> 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
>            Priority: Minor
>              Labels: Signature, patch
>             Fix For: 2.0.9
>         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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