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The concept is simple, each game will be assigned X numbers of micro bitcoins (or something similar) each time the game is installed, it will send X automatically to the game maker. When the balance is zero, the game will start asking for money or will be crippled.
First, the only thing Bitcoin appears to do here is allow this scheme to work without the expense of running their own servers. The effect would be exactly the same if the game just "phoned home" each time it was installed. Second, as a limit on the number of installations, this is more of an attack on the used market than anything to do with copyright infringement.Quote
The encryption and validation of the clients will ensure that it is extremely difficult to be “hacked” as it’s based on bitcoin technology. Look at it this way, the same reason you can’t double spend bitcoins is the same reason you can’t double install a bitcoin protected video game.
The integrity of the blockchain has absolutely nothing to do with the resilience of client against being "hacked". The application is looking for some external signal, in this case a transaction on the blockchain, to decide whether to allow the game to run in the uncrippled mode. The rest is no different from any other contemporary DRM scheme, and the conventional DRM code, not the blockchain, is the part which will eventually be hacked. 
