Unlocked status - used as default permission for newly created or duplicated sites/templates. While a site/template is unlocked, all administrators in the account are granted full permission by default. As administrators cannot be removed from the list, the Remove button is greyed out. Non-administrators can be added or removed manually by clicking the Add or Remove button by their name;

Locked status - a user with an administrator role can change the site/template access permission to locked. Once a site/template is locked, the administrator who locked it should manually give access permission to the appropriate users and administrators. Only users and administrators who were given access permission can view and edit the site/template;