Step1: Click "Open" button of the File Name to browse the full path of the PDF file.
Select the target PDF file in the Open File window and click "Open".
Step2: On the "Recovery" tab, select "Brute-force Attack (Trying All Possible Combinations)".
Step3: Click "Start" button in the Menu to initiate the program.
Step4: Some time later, a message box pops up to you, showing the User Password expected. Click "Remove All Passwords from the File" to remove all the restrictions placed on the PDF file. Click "OK".
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