Perdue, who wrote "The Da Vinci Legacy" and "Daughter of God," claims Brown took plot elements from both books for his book. Lawyers for Brown argued Tuesday Perdue's claims are nonsense and urged Manhattan federal Judge George Daniels to dismiss a copyright-infringement suit, the New York Post reported.
In both books, the Da Vinci scholars battle secret societies over the fate of Christianity, and the plots discuss works by Leonardo Da Vinci. The plots are too similar to be coincidental, lawyers for Perdue argued.
Daniels said he would issue a ruling this spring.