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https://issues.apache.org/jira/browse/PDFBOX-4239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16504991#comment-16504991
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Tilman Hausherr commented on PDFBOX-4239:
-----------------------------------------
The point of having a signed PDF is to prevent what you're doing. Nevertheless
there is a somewhat complicated way to add text by using incremental saving
(unless the PDF has a "certified" signature), but PDFBox has a bug (part of the
oldest bug ever) that incremental saving doesn't work properly if the file is
signed.
> 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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