Change the policy of who can edit the site.
$ options = []
$ options.append(("/permission/open", "Anyone can edit"))
$ options.append(("/permission/loggedinusers", "Only loggedin users can edit"))
$ options.append(("/permission/restricted", "Only admins can edit"))
This updates "permission" and "child_permission" fields of /, /works, /books and /authors records in the database.