Short description of LastBit PDF Password Recovery 10.1.6805: Password decryption tool for Acrobat PDF (*.pdf) files. PDF Password recovers user and permission passwords only. PDF Password does not allow to decrypt DRM (Digital Right Management) system. If user password (also known as password to open) is either not set or known, decryption is being done instantly. Brute Force Attack and Dictionary Search must be used if a user password is unknown.