Software pirates who make illegal copies of a particular computer game are finding the games companies are coming up with a radical new anti-copying strategy.

Illegally copied games protected by the system work properly at first, but start to fall apart after the player has had just enough time to get hooked. As a result, the pirated discs actually encourage people to buy the genuine software, the developers say.

The new protection system, called Fade, is being introduced by Macrovision, a company in Santa Clara, California, that specialises in digital rights management, and the British games developer Codemasters, based in Leamington Spa. It makes unauthorised copies of games slowly degrade, so that cars no long steer, guns cannot be aimed and footballs fly away into space. But by that time the player has become addicted to the game.

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