1. On the Tools menu, click Protect Document.
2. In the Protect Document task pane, select the Allow only this type of editing in the document check box.
3. Do one of the following:

   Let reviewers change the document by inserting comments and tracked changes

   1. In the list of editing restrictions, click Tracked changes.
   2. Click Yes, Start Enforcing Protection.
   3. Type a password in the Enter new password (optional) box, and then confirm the password.

   Let reviewers insert comments only

   1. In the list of editing restrictions, click Comments.
   2. Click Yes, Start Enforcing Protection.
   3. Do one of the following:
      • To assign a password to the document so that users who know the password can remove the protection, type a password in the Enter new password (optional) box, and then confirm the password.
      • To encrypt the document so that only authenticated owners of the document can remove the protection, click User authentication

• On the Tools menu, click Unprotect Document.

Note  If you used a password to add protection to the document, you'll need to enter the password before you can stop the protection.