You can password-protect any PDF document (define owner and user passwords). And to set user permissions.
Go to the "Operations" section of the program, and choose "Encrypt PDF" item. Enter the owner and user password
When ready, click the "Remove" button to start the process.
You also need to set User Permissions such as Print, modify, Copy, Annotation, Form filling, Accessibility, Document assembly, High resolution printing.
When ready, click the "Encrypt" button to start the process.