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https://issues.apache.org/jira/browse/PDFBOX-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16763591#comment-16763591
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Osman commented on PDFBOX-4433:
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Okay, I am sorry, it is my bad. I am trying to sign a document with its content
and form elements whose id is not excluded in the Fields dictionary.
My aim is to sign a document with a form field whose id added in the lock
fields (exclude list) array and after signing I want to change the value of
that field and sign it again by not adding this id into the dictionary and
after that, If I change the value of that field, the signature should be
invalid. I hope that I was clear.
Tha case I am facing is the first signature is invalid.
I am asking that still here because in pdfbox's source code, I could not find
anything like SigFieldLock or FieldMDP.
Is it really supported?
Regards
> PDF Form updating while signing
> -------------------------------
>
> Key: PDFBOX-4433
> URL: https://issues.apache.org/jira/browse/PDFBOX-4433
> Project: PDFBox
> Issue Type: Task
> Components: Signing
> Reporter: Osman
> Priority: Major
> Labels: how-to
>
> Hi All,
> Actually I wanted to ask a question, I could not find the appropriate place
> to ask. If there is a more appropriate place, please forward me.
> My question is that I want to sign documents in a sequence but between
> signings, I want to change some fields which have their own signatures. It is
> supported by PDF and until now I always used PDFBox but I could not achieve
> it.
> Whenever I sign a document and change a field and sign again, previous
> signature becomes invalid.
> How can I solve this problem?
> Regards
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