One of the most high-profile and potentially far-reaching copyright cases seen in the British courts recently started on Monday, with two authors of a non-fiction book suing Random House, publisher of Dan Brown's best-seller The Da Vinci Code, over alleged infringement. 

Michael Baigent and Richard Leigh are claiming that the American author’s best-seller appropriated major themes and ideas that they – along with a third individual – explored in a 1980s work called The Holy Blood and the Holy Grail.