Revolution Slider and other plugins included in our theme are external and we have the right to build them into our theme as we purchase the Extended License for each of these plugins.
The plugins are functioning perfect without any activation.
These plugins registration is not obligatory! The plugin activation option was added in the plugin only for the customers to get automatic updates and support directly from plugin developers. Only in case you need this features you will need to purchase and register the plugin. This is not only our practice but all the theme authors from ThemeForest.