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https://issues.apache.org/jira/browse/PDFBOX-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17714716#comment-17714716
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Chris Newhouse commented on PDFBOX-5585:
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Understood. Thank you and thanks for the reference!
> Adding new Field to form during saveIncremental invalidates prior signatures
> ----------------------------------------------------------------------------
>
> Key: PDFBOX-5585
> URL: https://issues.apache.org/jira/browse/PDFBOX-5585
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm, PDModel
> Affects Versions: 2.0.24
> Reporter: Chris Newhouse
> Priority: Major
> Attachments: signed-then-new-field-added-save-incremental.pdf
>
>
> It's possible that this is expected behavior, and that what I'm trying to do
> is just not possible, but:
> When I have some fields in a document, then sign the document, then add a new
> field to the document and `saveIncremental` sign it, the prior signatures are
> invalidated.
>
> The message is "Document has been altered or corrupted since it was signed".
>
> The final signature on top of that is good, and the new field is there...but
> the old signatures are invalid. Is it possible to add a new field and not
> invalidate the old signatures? I've successfully edited existing fields, but
> can't get it a to be OK after adding a new field.
>
> I've attached a sample document.
>
> Thank you for your help!
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