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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 7:55 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 (e.g. by Adobe) 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 (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".
> 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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