Sorry for all the posts but I guess things are coming into focus:
http://kotaku.com/you-will-be-able-t...cros-509140825
Other users on the console will be able to play that game as well, Harrison said. So you don't need to buy multiple games per family.
"It sits on your harddrive and you have permission to play that game as long as you’d like," Harrison said.
"The bits that are on that disc, you can give it to your friend and they can install it on an Xbox One," he said. "They would then have to purchase the right to play that game through Xbox Live." "They would be paying the same price we paid, or less?" we asked. "Let’s assume it’s a new game, so the answer is yes, it will be the same price," Harrison said.
This is interesting though, their own used game store? Or rather, "second-hand" rights store.
"We will have a solution—we’re not talking about it today—for you to be able to trade your previously-played games online," Harrison said.