[InclinedPlane]

Disc is required for disc-required play. Code is required for discless play.

They'd buy the code from the people that made the game, of course. If you want to install the game to the console and play it without a disc present then it's trivial to process that through a workflow that requires some sort of purchase.

You can have the best of both worlds if you like.

If it makes it any simpler just think of it as downloaded vs. disc-based games. You can pay to download the game to your console or you can play the game off of a disc. For convenience you could include a free download code in each new game, or even just provide a discount.