[Azu-nyan]

Alright, here's how it goes: All that MS cares about is that you have no more than 3 computers and 3 Zunes using the content. They can tell computers because computers will identify themselves to the Zune servers (not sure if different accounts on the same computer will count as separate, but I know they have separate libraries). Zunes can also be identified specifically, and MS can keep track of which ones are authorized to connect. You can deauthorize a Zune by delinking it from the Social account, but I'm not sure how to deauthorize a computer (perhaps an uninstall?). Sharing schemes are not entirely uncommon, it's a tactic used to get international users the Zune Pass by having a US member and two international members to split the cost and use the US account. Again, who actually uses the account doesn't matter, you're paying for the license to three Zunes and computers, not for any specific amount of people. So long as it stays on those devices, there's no problem. Also, the file format is DRM'ed .wma, I believe.