I firmly believe Disney learned of the plans to make the Da Vinci Code into a movie...and set about designing their own variant (although the story is different the background is the same)...
called "National Treasure"....
and all in a ploy to distract veiwers from seeing the Da Vinci Code because it would heighten interest in the subject...
in "The Da Vinci Code" Dan Brown states that Walt Disney was associated with the Free Masons....
now if I were a conspiracy theorist I would say Disney developed this movie early in hopes of taking possible viewers of the Da Vinci Code....steering these viewers in Disney's direction... figuring that the future reviews of the Da Vinci Code will be discribed as "another conspiracy adventure movie like Disney's National Treasure.." and put viewers off...
either that or Disney executives are still heavily involved in the Free Masons and wish to use "National Treasure" as a sort of pilot film to setup for the future blockbuster "the Da Vinci Code"...and are hoping as a side effect will renew interest in their secret society...bringing money laden investors into their group....
never mind the fact that Disney will still make a ton of money off the National Treasure regardless of their involvment with The Da Vinci Code....
ok back to reality