Encrypt a PDF on a Mac Using Adobe Acrobat
1. From Adobe Acrobat, open the PDF you wish to encrypt. From the Acrobat menu, click View, then select Tools. From the Tools menu, select Protection.
2. Select Encrypt with Password.
3. Click Yes
4 From the Password Security Settings menu, select from the options given to set various protections for the document. When you're finished making your selections, click OK.
5. IMPORTANT: When setting a password for a document, remember to save the password in a secure location, such as a password vault (TCIT recommends using LastPass for securely storing passwords. Contact the Service Desk to get LastPass)