This feature enables you to restrict the default organization administrator from changing his control panel password using the organization control panel. Even any other organization administrator cannot change the password of the default organization administrator using the control panel. But if the service provider or the reseller of that organization logs in automatically into the organization control panel, then he can change the password of the default organization administrator in the organization control panel.
Since this feature is disabled by default, you need to enable it to use it. This feature provides you with the flexibility of both enabling or disabling the feature completely.