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https://issues.apache.org/jira/browse/PDFBOX-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16295840#comment-16295840
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Michael Klink edited comment on PDFBOX-3198 at 12/18/17 11:31 PM:
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Yes, a document describing Adobe's approach dating back to 2006. And already
here Adobe says
> standardizing the appearance is not necessary for the cryptographic
> purpose of verifying a signature, but makes for a consistent user
> experience.
As far as I can see the only situation in which this "consistent user
experience" plays a role is the case of pre-created signature fields (with a n0
background layer) to which a signing software merely adds a n2 layer, the
original n0 still being visible as background, and yet another signature
remover can remove the n2 of the signature and keep the n0 background. .
This is not a user case implemented in pdfbox, is it?
was (Author: mkl):
Yes, a document describing Adobe's approach dating back to 2006. And already
here Adobe says
> standardizing the appearance is not necessary for the cryptographic
> purpose of verifying a signature, but makes for a consistent user
> experience.
As far as I can see the only situation in which this "consistent user
experience" plays a role is the case of pre-created signature fields (with a n0
background layer) to which a signing software merely adds a n2 layer, the
original n0 still being visible as background.
This is not a user case implemented in pdfbox, is it?
> 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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