Harrison then explained what happens when you want to take that game beyond the borders of your own home and into a friend's place.
"I can come to your house and I can put the disc into your machine and I can sign in as me and we can play the game," he explained.
"The bits are on your hard drive. At the end of the play session, when I take my disc home - or even if I leave it with you - if you want to continue to play that game [on your profile] then you have to pay for it. The bits are already on your hard drive, so it's just a question of going to our [online] store and buying the game, and then it's instantly available to play.
"The bits that are on the disc, I can give to anybody else, but if we both want to play it at the same time, we both have to own it. That's no different to how discs operate today."