Probably the last man who knew how it worked had been tortured to death years before. Or as soon as it was installed. Killing the creator was a traditional method of patent-protection.
Terry PratchettCutangle: While I'm still confused and uncertain, it's on a much higher plane, d'you see, and at least I know I'm bewildered about the really fundamental and important facts of the universe. Treatle: I hadn't looked at it like that, but you're absolutely right. He's really pushed back the boundaries of ignorance. They both savoured the strange warm glow of being much more ignorant than ordinary people, who were only ignorant of ordinary things.
Terry PratchettSometimes I feel that the world is made up of sensible people who know the plot and bloody idiots who don't.
Terry PratchettI'm not the world's greatest expert, but I would have thought that the wizards, witches, trolls, unicorns, ... broomsticks and spells would have given her a clue?' - when J.K. Rowling insisted she wasn't writing fantasy.
Terry Pratchett