Criticism of The Da Vinci Code "Smithy Code Jackie Fisher who are you Dreadnought", referring to the British admiral whom Judge Smith admires. As with the book, this secret message made use of Fibonacci numbers for its encoding. Dan Brown has been sued twice in The United States by author Jack Dunn who claims Dan Brown copied his book The Vatican Boys (1997) to create The Da Vinci Code, Angels & Demons and Brown's now famous character Robert Langdon. Jack Dunn calls Dan Brown's actions, "The Largest Literary and Movie Crime in History." At a conference on April 28, 2006 Archbishop Angelo Amato, the secretary of
The Da Vinci Code of some of the more controversial aspects being fact on his web site, stating that the "FACT" page at the beginning of the novel mentions only "documents, rituals, organization, artwork and architecture", but not any of the ancient theories discussed by fictional characters, stating that "Interpreting those ideas is left to the reader". Brown also says, "It is my belief that some of the theories discussed by these characters may have merit" and "the secret behind "The Da Vinci Code" was too well documented and significant for me to dismiss." In 2003, while promoting the novel, Brown was asked in