Watch the working preview of software and simply follow the steps :
Launch the software from the installation location. This is the screen that apears, then click on Unlock .
Click browse to select the PDF file that is to be unlocked.
As the file is donwloaded,the software shows the stats for the loaded file.Click on browse to select the destination folder for the decrypted copy of PDF file.
Now click on Unlock PDF to start the process.
As the process is done, the software shows a difference between before and after the unlocking process.
Now test the unlocked PDF file by performing operations like copying, pasting, printing operations.