thx a lot for your great work.
By debugging i better understood that the problem is that moddate attribute
(and probably other things) will change at every open.
I think that, now that the problem is clear, i can solve it quickly.
I have yet some doubt...
My input document is a PDF/A, that (by specification), is an unmodifiable.
This is non really true because  i can sign it, so i will modify it!
I understand why itext will modify the moddate at each save, but i think
that PDF/A and modDate are in conflict.
But i think this is a specification problem.

thx
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