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PDF multiple (digital) signatures and countersignatures

Posted: 07/24/2013 05:22:36
by Francesco Geri (Basic support level)
Joined: 10/08/2012
Posts: 7

using SecureBlackBox, is it possible to apply on a PDF document multiple signatures or a counter-signature?

I tried to add a multiple signature simply using AddSignature() method and it seems to me that it is all ok (Acrobat reader tell me that the document has 2 valid signatures).

But how can I counter sign a PDF document?
I don't know if this is a valid operation: I have read on this post (2008, March)
that it is not supported by PDF specification, but I don't know if it is now possible.

Thank you for any support.
Posted: 07/24/2013 05:34:51
by Ken Ivanov (Team)

Hello Francesco,

While PDF standard does not contain provisions for countersigning, adding another signature to a signed document is per se a countersigning operation, as a subsequent signature covers not only the document itself, but also all signatures already contained in it.

In strict terms, PDF standard does not support countersigning though.
Posted: 07/24/2013 08:06:29
by Francesco Geri (Basic support level)
Joined: 10/08/2012
Posts: 7

Many thanks!



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