Lock PDF adds a password on this device and downloads the protected file. Unlock works only when you already know the password.
If you forget the password, UtilityAll cannot recover it. The file is never stored here, and there is no reset.
Questions
Can this crack a PDF password?
No. Unlocking requires the password you already know.
Is the password saved?
No. It is used in this tab to lock or open the file, then discarded.