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08-28-2008, 07:54 PM
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Re: Clearing digital signatures
You can set up PDF with multiple signatures -- the challenge is to define "changes" to the document that could invalidate it. Technically adding another signature changes the document. Using a certified document approach that allows form fill-in and digital signatures only means that if anyone make changes other than filling in a form field or signing a signature field, the entire document becomes "invalid".
You can find more information on the certified document approach at: <http://www.adobe.com/devnet/acrobat/pdfs/digsig_user_guide.pdf> 
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