Warner Bros. Entertainment Inc. v. RDR Books York trial attorney, David Hammer. Ms. Hasse then asked a group of intellectual property lawyers at Stanford Law School to help defend RDR Books' right to publish. Fair Use Project Executive Director Anthony Falzone said the Lexicon is protected by U.S. law which has long given people "the right to create reference guides that discuss literary works, comment on them and make them more accessible." On 16 January 2008, Rowling and Warner Bros. filed their full 1,100 page complaint against RDR Books, claiming that the book compiles and repackages Ms. Rowling's fictional facts derived wholesale from the Harry Potter works
Legal disputes over the Harry Potter series are unauthorized because the publisher failed to honour its contractual obligations to her. In 2005, Warner Bros. offered CAD$5,000 (later CAD$50,000) to the Canadian folk band the Wyrd Sisters for the rights to use their name in the film version of "Harry Potter and the Goblet of Fire". Rowling had written a scene in the novel in which a band called the Weird Sisters appeared at a school dance, and the group owned the rights to the name in Canada. However, the offer was declined, and instead the band undertook a legal action against Warner Bros., as well as Jarvis