Quote:
Originally Posted by fargo
Could you please direct me to a source or a tutorial explaining how to modify password-protect PDFs while preserving their certificates?
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I have removed passwords from PDFs with some windows program (whose name I don't remember). I have removed print/copy restrictions from PDFs with pdftk (I had to modify the source code, but it was very, very easy).
Why do you need to preserve the certificates? Someone willing to alter the text would remove any certificate too, and the recipients of the modified file will have no way to know it has been modified (other than going to the original source and realizing that "hey! why doesn't my file have a password?", which is basically equivalent to providing a hash/signature/digest).