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https://issues.apache.org/jira/browse/PDFBOX-4239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16503106#comment-16503106
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Maruan Sahyoun commented on PDFBOX-4239:
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What do you mean by invalid signature? Does Acrobat/Reader show a yellow
exclamation mark. Could you upload a sample file with the correct signature and
after the text was applied.
Did you do an incremental save or a full save?
When you change a signed document there will always be a hint within
Acrobat/Reader about the fact that the document has been changed after the
signature. Using Acrobat the user would be able to chekc which changes were
done to the document. That's normal for a signed document and not a
misbehaviour.
> How to avoid invalid signature after pdfbox modify a signed PDF
> ---------------------------------------------------------------
>
> Key: PDFBOX-4239
> URL: https://issues.apache.org/jira/browse/PDFBOX-4239
> Project: PDFBox
> Issue Type: Wish
> Components: Signing
> Affects Versions: 2.0.2
> Reporter: Lux
> Priority: Major
>
> Dear Team
> Our team need add some text into a signed PDF, But we got a pdf with an
> invalid signture.
> So that sometimes we can't view it on IE.
> Do you know how to avoid invalid signature after modify a signed pdf.
> Looking forward your reply. Thanks in advance.
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