Here is an online article about Blizzard overseeing what everyone does in its games and the accusation that this is spying on players, and possibly an invasion of privacy.

Warden watches as gamers explore Warcraft's world
Game maker Blizzard has been accused of spying on the four million players of World of Warcraft.

Net activists branded software used to spot cheats "spyware" because it gathers information about the other programs running on players' PCs.

In its defence Blizzard said nothing was done with the information gathered by the anti-cheat software.

You can read the whole article here.