It ended up in the Dutch courts, which concluded quite rightly Big Brother was nothing like Survivor. I'm sure there was a legal challenge in the US - don't think it went anywhere though as even when Big Brother became Survivor in a House it was still nothing more than a show in the same genre that had it's origins in another format.
Dutch courts rule that 'Big Brother' does not steal from 'Survivor'
No wonder television schedules are full of copycat shows.
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