The following page should give you an overview:

http://learn.adobe.com/wiki/display/security/Document+Library

(especially the second document (Digital Signatures in PDF) should be of
interest to you)

ToM

2010/5/21 Julien zitoune <julien_16_...@hotmail.com>

>  Hi,
>
> I'm new on your forum, I'm currently trying to sign a PDF file. I
> understood that iText library can be used for that but I would like to
> develop it by myself. I have tried to search documents explaining the
> principle of the PDF signature but my program does not sign correctly.
>
> So please could you help me, have you some documents explaining concretely
> what I have to do to sign PDF ?
>
> Thanks you,
>
> Julien
>
>
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