How to Encrypt a Document on a Mac Using Preview
1. From your Mac, open the document you wish to encrypt using Preview. Once Preview is open, click on File. From the File menu, select Export as PDF.
2. Select Show Details
3. Check the box next to Encrypt, then enter a password. Once you have entered and verified a password, click Save
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)