I don't know if it can be meaningful (may be not, I am not a programmer) but I have noticed that the working decrypted pdf files (I have two) changes only a little their size (6 or 8 bytes) after the decryption process, while the non-working decrypted one differs from the encrypted one for more than 100 bytes, from 1839 it goes to 1727 Kb. It seems that something get lost in the process. Thankd to all for the work..
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