An author who is suing the publishers of “The Da Vinci Code” admitted Tuesday in a British court that he had exaggerated his case that the best-selling novel had copied his own work.

Michael Baigent and Richard Leigh, authors of the 1982 nonfiction book “The Holy Blood and the Holy Grail,” are suing Random House, publisher of Dan Brown’s “The Da Vinci Code.” They claim that parts of their work formed the basis of Brown’s 2003 novel, which has sold more than 40 million copies and has been made into a film starring Tom Hanks.