It's more about "protecting" it from unlicensed publishers in general, irrespective of whether they're producing unauthorized copies. Indeed, recent schemes have made it markedly easier to copy games without authorization than to publish original games without authorization. The former only requires subverting a protocol used to decide whether a copy is authorized (e.g. by altering optical drive firmware or outright replacing the drive with an emulator); the latter requires breaking the platform's crypto services.
