Michael, it´s  very complicate to explain for you, but I will try...  I have
a new legal process to follow where the signed PDF document CAN BE converted
to other file standard, like .P7S type. I think the P7S viewer will not show
the first signatures after the conversion. So, I need to guarantee the first
signatures, I don't know, I think to store the signature data, or some like
that, inside other legal document in order to prove later that fisrt PDF
document is autentic.  Seems a crazy way but that's what I was asked to
investigate.

I don't know if exist some P7S viewer or signer that can keep and show the
PDF signatures (that would solve the problem). 

It's a new process to be implemented and I don't know yet the best way to
follow.

tks a lot.

PS. About the byte ranges, I get it



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