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https://issues.apache.org/jira/browse/PDFBOX-4702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986404#comment-16986404
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Jason Pyeron commented on PDFBOX-4702:
--------------------------------------
On a side note, there may be more to do.
"It is unknown what changes may have been made to this document since this
signature was applied. Click on 'Compute Modifications List' to compute the
list of modifications."
!image-2019-12-02-16-50-30-220.png!
Then it shows:
!image-2019-12-02-16-51-06-551.png!
> 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, image-2019-12-02-16-50-30-220.png,
> image-2019-12-02-16-51-06-551.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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