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https://issues.apache.org/jira/browse/PDFBOX-4702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986366#comment-16986366
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Jason Pyeron commented on PDFBOX-4702:
--------------------------------------

Yes the patch will be here.

The links are for housekeeping.

there were about 20 causes, the direct/indirect was the last of them.

The code is tightly coupled in our product's source right now.  [Bug 
1971|https://projects.pdinc.us/show_bug.cgi?id=1971] is assigned, albeit at a 
low priority, to create a patch for PDFBox.

The thought would be to provide a few utility functions, e.g.

PDSignature.signForFiledMDP(appearance, other data...)

PDocument.prepareForDigitalSignatureAndIncrementalSave(????)

 

> signature verification in Adobe products
> ----------------------------------------
>
>                 Key: PDFBOX-4702
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4702
>             Project: PDFBox
>          Issue Type: Improvement
>            Reporter: Jason Pyeron
>            Priority: Major
>         Attachments: image-2019-12-01-17-33-28-155.png, 
> image-2019-12-02-06-31-12-527.png, pdfbox-4702-signed-Adobe.pdf, 
> pdfbox-4702-signed-PDFBOX-Tilman.pdf, pdfbox-4702-signed-PDFBOX.pdf, 
> pdfbox-4702-unsigned-SignedAndLockedWithLocking.pdf, 
> pdfbox-4702-unsigned.pdf, pdfbox-4702.pdf, screenshot-1.png, test_signed.pdf
>
>
> Signatures with appearances have some unknown validation, that is resulting 
> in "Bad parameter" error when validating. 
> See mailing list thread: 
> https://lists.apache.org/thread.html/dde2f9531be0126402251b9fa95bd2274c1162fe5806420cbe1ca9ee@%3Cdev.pdfbox.apache.org%3E



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