Eric:
Like you, I am new on this subject.  However, I do like share my experience on 
it with you.

1)      In my project, the version is 5.0.6.0 (Runtime Version: V2.0.50727), 
while your is higher which may not be free.

2)      I am using VS2010.  I am not sure what is your IDE.
Yours,
Shaning

From: Eric Chow [mailto:eric...@gmail.com]
Sent: Wednesday, July 20, 2016 3:17 AM
To: Post all your questions about iText here
Subject: [iText-questions] Cannot verify PDF after digital signed using iText 
by Acrobat reader can!

Hello,

I use iText to signed a PDF with PKCS#11. It shows VALID in the Acrobat Reader 
but it shows error using the iText code to verity. Would you please to teach me 
what's my problem?

Best regards,
Eric

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