Video games developer Eidos have come up with a novel way of catching users playing pirated copies of their game.
Players using illegal copies of Batman: Arkham Asylum have found that essential control functions in the game have been disabled, rendering it unplayable.
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An Eidos community manager replied, saying the user had encountered "a hook" in the copy protection system, designed to "catch out people who try and download cracked versions of the game for free".
"It's not a bug in the game's code, it's a bug in your moral code," he added.