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https://issues.apache.org/jira/browse/PDFBOX-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16037039#comment-16037039
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Tilman Hausherr commented on PDFBOX-3198:
-----------------------------------------

I did some reading of
https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PPKAppearances.pdf
and wrote a post to the dev mailing list... we are not to use the n1 layer at 
all. Both text and image should be in the n2 layer and the n0 layer should be 
empty.

> 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: helloworld_signed.pdf, pdfbox-n2-2.patch
>
>
> The patch adds N2 layer support to visible signatures.



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