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https://issues.apache.org/jira/browse/PDFBOX-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17152873#comment-17152873
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Michael Klink commented on PDFBOX-4907:
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An issue of {{test_file_signed.pdf}}: The signature field has the name
*Signature1* but there already is a text field with the same name in the file.
As fields with the same name must be the same, Adobe assumes the signature
field to be some copy of the text field.
After changing the name of the signature field Adobe Reader finds the signature
but, of course, considers it invalid, after all I changed the file...
The same issue in {{test_file_signed_with_adobe_resigned_pdfbox.pdf}}.
Please make sure you don't use a signature field name which already is
otherwise in use.
> Signature not detected by Acrobat Reader
> ----------------------------------------
>
> Key: PDFBOX-4907
> URL: https://issues.apache.org/jira/browse/PDFBOX-4907
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.20
> Reporter: Claudio Cheli
> Priority: Major
> Attachments: test_file.pdf, test_file_signed.pdf,
> test_file_signed_with_adobe_resigned_pdfbox.pdf,
> test_file_signed_with_adobe_resigned_pdfbox_risigned_adobe.pdf
>
>
> Hello,
> i've signed the attached pdf [^test_file.pdf] with PdfBox 2.0.20 (signed
> document [^test_file_signed.pdf]), but Adobe Acrobat Reader doesn't detect
> the signature.
> During the signature process there seems to be no error.
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