1)   PDF Password Unlock Pro 3.9.5.1.01991.01
PDF Password Cracker Professional edition allows to search for "owner" and "user" passwords with brute-force and dictionary attacks, effectively optimized for speed.
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 2)   PDF password Unlocker 3.9.5.1.01991.01
The standard security provided by PDF consists of two different methods and two different passwords. A PDF document may be protected by password for opening ('user' password) and the document may also specify operations that should be restricted.
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 3)   Abcom PDF Password Cracker Pro 6.4.2.1218991.01
PDF Password Cracker Professional edition allows to search for "owner" and "user" passwords with brute-force and dictionary attacks, effectively optimized for speed.
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