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https://issues.apache.org/jira/browse/PDFBOX-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985190#comment-14985190
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Michael Klink edited comment on PDFBOX-3017 at 11/2/15 1:10 PM:
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{quote}
{{prepareNonVisualSignature}} clears the AcroForm *DR*
({{acroForm.setDefaultResources(null)}}) which is not good if there are other
form fields
{quote}
The pendant for this issue in the context of visual signatures has been
observed in real life, cf. the stackoverflow posting [PDFBox 1.8.10: Fill and
Sign Document, Filling again fails|http://stackoverflow.com/a/33174411/1729265].
was (Author: mkl):
{quote}
{{prepareNonVisualSignature}} clears the AcroForm *DR*
({{acroForm.setDefaultResources(null)}}) which is not good if there are other
form fields
{quote}
This issue has been observed in real life, cf. the stackoverflow posting
[PDFBox 1.8.10: Fill and Sign Document, Filling again
fails|http://stackoverflow.com/a/33174411/1729265].
> Improve document signing
> ------------------------
>
> Key: PDFBOX-3017
> URL: https://issues.apache.org/jira/browse/PDFBOX-3017
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
>
> Improve signing code:
> - incremental save only works for signatures and doesn't respect certificates
> such as Adobe Extended Usage Rights
> - {{prepareNonVisualSignature}} clears the AcroForm DR
> {{acroForm.setDefaultResources(null)}} which is not good if there are other
> form fields
> - visual/nonVisualSignature should move into the {{interactive.forms}}
> package and be handled within the signature field
> - verify signature (to have tests that go full circle)
> - document or refactor / rewrite visible labyrinthine signature code
> - ... your ideas...
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