Die Hard 4 was never made. Willis liked the Tears of the Sun title so much that he requested that one of his films, made in 2002, be re-titled Tears of the Sun (instead of Hostile Rescue or Man of War) in exchange for starring in another Die Hard film. This is why it is often mistakenly reported that Tears of the Sun was originally going to be the fourth Die Hard film. Script and title The film's plot is based on an earlier script entitled WW3.com by David Marconi, screenwriter of the 1998 film Enemy of the State. Using John Carlin's Wired magazine article entitled "A Farewell to Arms", Marconi crafted a screenplay about a cyber-terrorist attack on the United States. The fictional attack concept is called "fire sale" in the movie, depicting a three-stage coordinated attack on a country's transportation, telecommunications, financial, and utilities infrastructure systems. After the September 11, 2001 attacks, the project was stalled, only to be resurrected several years later and rewritten into Live Free or Die Hard by Doug Richardson and eventually by Mark Bomback. Willis said in 2005 that the film would be called Die Hard 4.0, as it revolves around computers and cyber-terrorism. IGN later reported the film was to be called Die Hard: Reset instead. 20th Century Fox later announced the title as Live Free or Die Hard and set a release date of June 29, 2007 with filming to begin in September 2006. The title is based on New Hampshire's state motto, "Live Free or Die", which is attributed to a quote from General John Stark. International trailers use the Die Hard 4.0 title, as the film was released outside North America with that title. Early into the film's DVD commentary, both Wiseman and Willis note a preference for the title Die Hard 4.0. Visual effects For the visual effects used throughout the film, actor Bruce Willis and director Len Wiseman stated that they wanted to use a limited amount of computer-generated imagery (CGI). One VFX producer said that "Len was insisting on the fact that, because we’ve got Transformers and other big CG movies coming out, this one has to feel more real. It has to be embedded in some kind of practical reality in order to give it that edge of being a Die Hard." Companies such as Digital Dimension, The Orphanage, R!ot, Pixel Magic, and Amalgamated Pixels