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https://issues.apache.org/jira/browse/PDFBOX-3817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043149#comment-16043149
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Tilman Hausherr commented on PDFBOX-3817:
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in PDFBOX-3668 [~tom_1st] sent me the file and explained that signing brought
"WARNING: The stream doesn't provide any stream length, using fallback
readUntilEnd, at offset 1508". The cause turned out to be that empty COSStreams
(like for n0) didn't have a length. The last commit fixes that.
> Signature form names not standard
> ---------------------------------
>
> Key: PDFBOX-3817
> URL: https://issues.apache.org/jira/browse/PDFBOX-3817
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.6
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Fix For: 2.0.7, 3.0.0
>
> Attachments: helloworld_signed.pdf
>
>
> We are not using the correct form names in our signature classes. The n2
> layer is named "n1" in 2.0 and "n0" in 1.8. The n0 layer should be empty. The
> holding form must be named "FRM" and not "FRM1" or "FRM0", see
> https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PPKAppearances.pdf
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