Valve Bans Gray-Market Modern Warfare 2 Keys

Kotaku writes: Some who bought CD keys for Modern Warfare 2 - no physicial media in other words - from import resellers have seen their access to the game vanish, as Activision has apparently asked Valve to ban such keys.

A poster in Valve's official forums complained that a key he bought through G2Play.net no longer lets him open and play the game. A Valve representative, BurtonJ, called such sales "illegitimate" and confirmed the ban. He recommends buying a full version of the game - maybe through Steam? Hint hint.