FADE is a special anti-piracy system created by Codemasters. Instead of preventing the game from being installed or run, when it detects that the game has been pirated, it will gradually disrupt play, altering or disabling features until the game is unplayable.

FADE was first used in Operation Flashpoint: Cold War Crisis, developed by Bohemia Interactive, who have since created their own version of FADE called DEGRADE, which they've used in games such as Take On Helicopters.
Contributed by KidDivinegon