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https://issues.apache.org/jira/browse/PDFBOX-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16297324#comment-16297324
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Michael Klink edited comment on PDFBOX-3198 at 12/19/17 7:52 PM:
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Ah, that should have been "use case".
I mean the use case in which
* the pdf with an empty signature field is generated by some software (e.g. by
Adobe) including Adobe style appearance XObjects with a non-empty background in
n0;
* the signature field then is signed by pdfbox, adding a foreground in a n2
layer but keeping the original n0 background as is, shining through where the
foreground is transparent; and
* (optionally) the signature field may be "unsigned" again by either pdfbox or
some other software by removing the signature value and the n2 layer but
keeping the n0 layer, the field looking again like before the signing step.
Support for that combined use case using different pdf processors might be what
Adobe calls a "consistent user experience".
was (Author: mkl):
Ah, that should have been "use case".
I mean the use case in which
* the pdf with an empty signature field is generated by some software including
Adobe style appearance XObjects with a non-empty background in n0;
* the signature field then is signed by pdfbox, adding a foreground in a n2
layer but keeping the original n0 background as is, shining through where the
foreground is transparent; and
* (optionally) the signature field may be "unsigned" again by either pdfbox or
some other software by removing the signature value and the n2 layer, looking
again like before the signing step.
Support for that combined use case using different pdf processors might be what
Adobe calls a "consistent user experience".
> Visible Signature N2 layer
> --------------------------
>
> Key: PDFBOX-3198
> URL: https://issues.apache.org/jira/browse/PDFBOX-3198
> Project: PDFBox
> Issue Type: New Feature
> Components: Signing
> Affects Versions: 1.8.11
> Reporter: Frank Cornelis
> Priority: Minor
> Attachments: PDFBOX-3198-visible-signature.zip,
> PDFBOX-3198-work-5.5.2017.zip, helloworld_signed.pdf, pdfbox-n2-2.patch,
> signed.pdf
>
>
> The patch adds N2 layer support to visible signatures.
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