Making a Category Read-Only
You may want to make a category read-only so that users can use the symbols without deleting or rearranging them. To make a category read-only, set the read-only file attribute for the category file using Windows Explorer. To determine the filename of a category, right-click the category and choose Properties.
When a category is set as read-only, users cannot delete, move, rename, or add to its symbols.