Recover PDF Password allows you to recover and find the password of a PDF file that you have lost or forgotten.
PDF Password Recover has a simple interface with only one window from which you can define the main preferences. PDF Password Recover offers 3 ways to search for a password. You can search based on the length of the password, by setting a number of characters from 1 to 128. Alternatively, you can search by template i.e. if you remember a part of the password, but cannot recall the whole key. Finally, there's an exhaustive search option which you can use if you can't remember the password at all.
The latter method requires the most amount of search time although the developers claim "100% success". but requires maximum time. This can literally take hours, even if the password is a simple one so make sure you've got plenty of time on your hands. The other options take less time but obviously require you to know certain parameters to start with.
Recover PDF Password is an effective, if slow way, to recover passwords from PDF documents which are legally yours.