[Mythrl]

Only one person of the 10 with whom you share can play at a time. This will not restrict you from playing though. It's not clear whether you can play a co-op game together on a single copy. To me this seems better than actually lending a disk to someone since you can still play your game while you lend it out.

I have no idea why Microsoft are saying outright you can't lend games, since you can share them. I think their messaging has been absolutely awful.

[inthewind]

So how does that work, your mate turns his PC on, and it kicks you out as you are fighting a boss? I assume not, but it does make you wonder.

This basically means that Microsoft will know exactly what you are playing, which machine you are playing it on, and when you are playing it. That combined with the connects camera is quite frightening.