PDF Passwor Decryption is done instantly. Decrypted file can be opened in any PDF viewer (e.g. AdobeAcrobat Reader) without any restrictions. -- i.e. with edit/copy/print functions enabled. All versions of AdobeAcrobat are supported. (including 7.x, 128-bit encryption)
PDF Password Remover can be used to decrypt protected AdobeAcrobat PDF files, which have "owner" password set. Free trial version of PDF Password Remover is available.
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.