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From Wikipedia...

Alan Moore, however, distanced himself from the film, as he has with every screen adaptation of his works to date. "All I'm asking them for," he reasons, "is the same kind of deal that they had no problem extending to Siegel and Shuster. I want them to say, 'We're not going to give you any money for your work, you're not going to get any credit for it, and we're not going to put your name on it.' I don't see the problem." The film, however, has also distanced itself from the original message by changing "V" into a debatable freedom fighter instead of an anarchist. An interview with producer Joel Silver suggests that the change may not have been conscious; he identifies the V of the graphic novel as a clear-cut "superhero...a masked avenger who pretty much saves the world," a simplification that goes against Moore's own statements about V's role in the story.