David Irving v Penguin Books and Deborah Lipstadt is a case in English law against American author Deborah Lipstadt and her publisher Penguin Books, filed in an English court by the British author David Irving in 1996, asserting that Lipstadt had libeled him in her book Denying the Holocaust. The court ruled that the Irving's claim of libel relating to English defamation law and Holocaust denial was not valid because his deliberate distortion of evidence has been shown to be substantially true. English libel law puts the burden of proof on the defence, meaning that it was up to Lipstadt and her publisher to prove that her claims of Irving's deliberate misrepresentation of evidence to conform to his ideological viewpoints were substantially true.