See http://itextpdf.sourceforge.net/howtosign.html#signtsocspcs. It does a lot 
more than you want but just remove the timestamp and ocsp. Other options are 
possible, look at the java examples, it's about the same in C#. 

Paulo

-----Original Message-----
From: xyester...@gmail.com [mailto:xyester...@gmail.com] 
Sent: Wednesday, August 04, 2010 1:07 PM
To: iText-questions@lists.sourceforge.net
Subject: [iText-questions] about the Signature by PFX

Hi,It's said you can use the PFX to sign PDF document.
Could you send the code to me?

I need to sign some PDF document which a digital signature.but I can't in the 
C#.

thank you so much!


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