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https://issues.apache.org/jira/browse/PDFBOX-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr closed PDFBOX-5182.
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Resolution: Implemented
Closing as this is already implemented and we didn't get any further feedback.
> Detect whether a Signature is out of Date
> -----------------------------------------
>
> Key: PDFBOX-5182
> URL: https://issues.apache.org/jira/browse/PDFBOX-5182
> Project: PDFBox
> Issue Type: New Feature
> Reporter: Ranjeet Kuruvilla
> Priority: Major
>
> Acrobat can detect, if a Signature is invalid. In particular one can see, if
> a Signature is outdated. That can happen, when a person signs a Document and
> then changes a Textfield or a Checkbox or any other field.
>
> It would be great, if one could detect, whether one could use PDFBox to
> detect whether a Signature has been invalidated.
>
> I attached the sign one can see in Acrobat once a Signature is invalidated
> !Invalid Signature.png!
> .
>
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