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https://issues.apache.org/jira/browse/PDFBOX-4702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986776#comment-16986776
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Michael Klink commented on PDFBOX-4702:
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{quote}[~jpyeron]> That is an invisible signature. A different test case, which
works.{quote}
For qualified input by others a proper description of the issue would have been
helpful.
You appear to meanwhile have solved the issue. Otherwise I'd have recommended
updating the issue accordingly.
> 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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