[quote name='Blaster man']What a cluster

for them. It doesn't even make

ing sense. If it plays used games then why does it require to be online to authenticate the game?[/QUOTE]
Sure it makes sense. Because this Azure authentication system (or whatever they're calling it.) is how you get used games.
1. Person A buys new. A has the original key. Finishes the game.
2. A sells to gamestop. Gamestop reports the serial or whatever. Person A can no longer play the game.
3. Gamestop sells it for $whatever. Msft and pub get their 10%.
4. Person B buys it from gamestop. They get a new serial to authenticate.
That's it. The difference here (according to polygon) would be that person B doesn't have to "pay a fee" to play the old game. (They simply are paying what gamestop is charging.)
Now,
1. Person Person B is done with it.
2. B sells to gamestop. Gamestop reports the serial or whatever. Person B can no longer play the game.
3. Gamestop sells it for whatever. Msft and pub get their 10%.
4. Person C buys it from gamestop. They get a new serial to authenticate.
That's why you always need authentication.
Rinse. Repeat.