Distributing Android app with CoronaCards

What is the best practice to distribute an Android app with CoronaCards integration. Following the documentation http://docs.coronalabs.com/coronacards/android/project.html

I see, one is suppose to place all the game(lua/assets) inside the assets folder. But this posses a question on the app copyright security, as anyone with the apk can get access to all game assets and code. Basically the whole game can be copied.

How do I prevent this ? Are there any code obsfuscation techniques for lua which I can use in my build ?