Making your document read-only helps prevent changes to that copy. It doesn’t prevent someone from making a new copy of the document and saving it with a different name or in a different place, but it keeps your original file intact.
- Click Review > Restrict Editing.
- Under Editing restrictions, check Allow only this type of editing in the document, and make sure the list says No changes (Read only).
- Click Yes, Start Enforcing Protection.
- In the box that opens, type a password you’ll be able to remember, and then type the password again to confirm it.
The password’s optional. But if you don’t add a password, anyone can click Stop Protection and edit the document.