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https://issues.apache.org/jira/browse/PDFBOX-5772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-5772.
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Resolution: Fixed
👍
> Inconsistent signature page handling when signing in existing signature fields
> ------------------------------------------------------------------------------
>
> Key: PDFBOX-5772
> URL: https://issues.apache.org/jira/browse/PDFBOX-5772
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.30, 3.0.1 PDFBox
> Reporter: Michael Klink
> Priority: Major
> Fix For: 2.0.31, 3.0.2 PDFBox, 4.0.0
>
>
> In eSig DSS issue DSS-3269 -
> [https://ec.europa.eu/digital-building-blocks/tracker/browse/DSS-3269] - it
> became apparent that {{PDDocument.addSignature(PDSignature,
> SignatureInterface, SignatureOptions)}} does not consistently handle the
> signature page while signing in existing signature fields:
> On one hand that method does look for an existing signature field of the
> given name and - if found - explicitly does not overwrite the link to the
> page of the widget. This implies that existing signature fields are supported
> as they are and are not to be re-located.
> On the other hand that method unconditionally adds the signature widget to
> the page indicated by the signature option page number.
> In the linked DSS issue this causes signing an existing signature field on
> different page than in the options to appear both on the original page and
> the option page which is not desired.
> Expected behavior would be that in case of an existing signature field and
> widget
> * either the signature option page is ignored and only the current page of
> the signature field is used
> * or the field widget consequentially is used to the signature option page,
> removing it from its original page.
> The natural option would be the former one.
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