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Hi, is there any way to effectively secure a pdf file?
It is quite easy to find web sites that allow unlocking pdf files ([Links removed by moderator]) even when they are protected with passwords.
Does any of you have good hints?
Thank you for your time, regards.
What exactly do you mean by "effectively secure a pdf file"?
If you use both non-trivial user and owner passwords and a more modern algorithm (e.g. AES-256), unlocking shouldn't be easy.