Now Alan Moore has been highly critical of every single one of the film adaptations of his comic works to the extent that he doesn't accept any money for them (he gives his share to the artists who worked on the original series) and has any reference to himself removed from the film.

Now admittedly none the films based upon his work (which incldues From Hell, Constantine and League of Extraordinary Gentlemen) have been anywhere near as good as the originals but I don't think they've been disasterous as films go. Anyway, Mr Moore has been so upset at his name being used in conjunction with promotion of the forthcoming 'V For Vendetta' film, including the Producer inferring that he was actually helping with the film, that he has publically condemned it and also pulled all of his future work from DC Comics after they didn't help issue retractions. His feud with DC has actually been on-going for many years in various guises.

Anyway, full story/rant can be found on the Comic Book Resources News Page and is certainly worth a read to anyone whose interest in Moore's works.