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https://issues.apache.org/jira/browse/PDFBOX-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16294871#comment-16294871
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Michael Klink commented on PDFBOX-3198:
---------------------------------------
Unfortunately I have not spotted this issue or PDFBOX-3817 ("Signature form
names not standard") before, so my warning most likely is a bit too late.
{panel}
*The PDF standard does not define any specific names for child XObjects of
signature appearances, nor does it specify the concept of layers. What you try
to emulate merely is Adobe's style in creating them.*
The Adobe's style includes these names and layers because in very early Adobe
Acrobat/Reader versions the determined validity of a signature was displayed by
showing additional layers provided by the PDF, a concept Adobe deprecated in
Adobe Acrobat 6 .
There is no need to adapt the Adobe style unless you want to create signature
fields with these deprecated additional layers.
{panel}
For a discussion of the deprecation of this layer concept, cf. [this stack
overflow answer|https://stackoverflow.com/a/40391641/1729265].
> 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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