You have to iterate over all the fields in the Fields array in the AcroForm 
dictionary looking for those of type Sig.

Of course, that will only tell you the number of signature fields.  For each 
field, you'll need to see if it's signed or not.

Leonard

-----Original Message-----
From: Alvaro Cuno [mailto:[email protected]] 
Sent: Friday, December 30, 2011 10:10 AM
To: [email protected]
Subject: [Podofo-users] digital signatures

Hi,

Is it possible to obtain the number of digital signatures in a pdf file 
directly? How can get a reference for them?

-
Alvaro

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