Did you know that you can restrict access to or prevent unauthorized users from modifying a PDF file using passwords?
To add password security to a PDF file:
- On the Advanced menu, point to Security, and then click Password Encrypt.
- Confirm that you wish to change security settings by clicking Yes.
- Enter the security settings, and then click OK.
- Confirm your password and then click OK.
- To finalize the security settings, save the PDF.