how can I unlock my PDF without password?
#2
Password is transformed to encryption key. Old files use 40-bit key, it can be found during reasonable time. If your file uses 40-bit key then you have good chances to decrypt data without exact password. Newer files use 128 or 256-bit key and require correct password.

Some utilities can remove restrictions and enable locked features. It doesn't mean access to encrypted content.
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RE: how can I unlock my PDF without password? - by nick8606 - 07-23-2025, 04:11 PM