Blizzard is very protective of its games, to the point that it's taking legal action against StarCraft II hackers.
According to Blizzard's complaint, the hackers are being sued for finding a way to circumvent Warden, which is software that Blizzard uses to ensure no unauthorized software to cheat is being used. "Warden enforces Blizzard's rights by running targeted scans of the user's environment for the presence and/or use of "signatures" of known unauthorized third party programs that facilitate cheating or allow the modification of the StarCraft II interface, environment, and/or experience..." states the complaint.
Blizzard alleges that the 10 hackers knowingly violated Blizzard's ToU and are infringing on Blizzard's copyright by creating unauthorized copies of the game.
Blizzard is demanding that defendants shut down their hacking software and provide Blizzard with all accounts of selling the illegal software, along with all lawyer fees and any assessed monetary damage.