Irving v Penguin Books Ltd

David Irving v Penguin Books and Deborah Lipstadt is a case in English law against American historian Deborah Lipstadt and her British publisher Penguin Books, filed in the High Court of Justice by the British author David Irving in 1996, asserting that Lipstadt had libelled him in her 1993 book Denying the Holocaust. The court ruled that Irving's claim of libel relating to Holocaust denial was not valid under English defamation law because Lipstadt's claim that he had deliberately distorted evidence had been shown to be substantially true.

Source: Wikipedia — Irving v Penguin Books Ltd (CC BY-SA 4.0)