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PDF Password Cracker Professional edition allows to search for ???owner??? and ???user??? passwords with brute-force and dictionary attacks, effectively optimized for speed (however, don??™t expect to recover long passwords in a reasonable time with these attacks). In addition, it has Key search attack, which guarantees the decryption (regardless the password length and complexity) of PDF files that use 40-bit encryption (the attack takes about 3-4 days on fast CPU systems).


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