Am 03.01.2018 um 12:34 schrieb Hesham Gneady:
I am asking if there is a way to copy the encryption dictionary(Or whatever you
call it) just as it is to re-encrypt the PDF file using it once again. I don't
want to reveal any password.
Oh. I haven't tried it - what you might try would be to change
COSWriter.java to skip this line:
securityHandler.prepareDocumentForEncryption(pdDocument);
But I don't know if this is good practice. The encryption keys (derived
from your keys) have a random component that is different for each PDF
even if your keys are the same. So maybe you're weakening encryption
this way.
Tilman
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