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https://issues.apache.org/jira/browse/PDFBOX-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951029#comment-14951029
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Tilman Hausherr commented on PDFBOX-3017:
-----------------------------------------

I don't like these "chained" calls in the visible signature stuff. I didn't 
like these calls in the 80ies, when I first saw them. Isn't this against the 
"law of demeter"?

> 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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