One thought: are you trying to design a form where one person signs in many places? That's a big no-no.
Sir, thank you for the quick response!
No, It's a 22-pages form with 25 different signatures using PKI.
Why is it a "big no-no" to have a form where the same user signs in multiple places???
Because a digital signature is always, without exception, on the whole file. To even talk about "signing a page" is a dangerous misconception. Users need to learn this, and check the whole file before signing once, or they will be subject to potentially bad consequences. (IE signing pages they never read, promising the moon!)
Also, each signature has a BIG overhead; the whole PDF had to be pumped through a certificate to read it. This quickly makes for a very slow PDF and above dozens the whole thing collapses.