How to Lock and Unlock PDF Files Using Same Tool
Run the software, choose an option from Protect PDF file or UnProtect PDF file. Hit on Next button.
Browse the location for single or multiple PDF files and hit on Next.
The PDF file description will be shown, then click on Next.
Now, choose the encryption level for the output PDF file
Afterward, provide the user and owner password. Also, you can select the other settings which you require and click on Next.
Secure your PDF file by clicking on Protect PDF button
Provide the path to save the resultant PDF file.
Click on OK when the saving process gets over.