mtrekker wrote:
> Coming back to the old subject I couldn't get my answer from search
> results...
>
> Per PDF standard, each signature is revision when working in append mode.
> How to solve the following reallife example:
>
> 1) user signs PDF and sends it to governement authority to complete
> acceptance
> 2) authority then needs to edit signed PDF by applying text approved/not
> approved
> 3) authority then signs this approved/not approved document
>
>
> Can signed PDF be edited so that there will be created a new revision ?
1. original document: not signed
2. Signed by citizen: in append mode or not; it doesn't matter
3. Government uses PdfStamper in append mode to stamp the words
Approved/Not approved and to add signature.
End result: a PDF with two signatures from which you can
extract the PDF signed by the citizen (without approved/not approved).
If the citizen signed in append mode, you can also extract the
original document.
See http://1t3xt.be/?X014
1:
http://1t3xt.info/examples/results/in_action/chapter16/unsigned_message.pdf
2: http://1t3xt.info/examples/results/in_action/chapter16/signed_message.pdf
3:
http://1t3xt.info/examples/results/in_action/chapter16/double_signed_message.pdf
The only different with your question is that the second stamper
isn't used to add "Approved/not approved".
--
This answer is provided by 1T3XT BVBA
http://www.1t3xt.com/ - http://www.1t3xt.info
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