Why worry so much about protecting so much the game assets? I mean, if a game gets popular enough, it will get hacked and dismembered, no matter what, it's only a matter of putting effort and time into hacking it. I dunno, it's like a never ending war. I don't know, it's just a personal opinion, but I would be happy people want my assets so bad, I might be doing something right.
It also plays an important role on yer game's popularity.