Toggle Protection lets you enable and disable protections on all objects in the Universal Shield window.
You add protections using File > Protect Object or File > Universal Shield Wizard. For those protections to be enforced, protection has to be ENABLED. You enforce protection by clicking the Unlocked button or selecting Security > Toggle Protection. Enabling protection enforces the Read, Write, Delete, and Visibility protections.
If protection is enabled, the padlock icon appears closed and the words Protection Is ENABLED display in the status bar. Otherwise, the padlock icon appears open and Protection Is DISABLED.