Eric Chow wrote:
> Hello,
> 
> In Acrobat Reader, when we define the "Directory Server", it can check 
> the automatic verify the digital signature when opening the PDF. (must 
> installed the root ca cert).
> 
> 
> How can I do this in iText?
> 
> Would you please to give me a simple example?

See verifySignatures in:
http://itextpdf.com/examples/index.php?page=example&id=222
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