Legal disputes over the Harry Potter series October 2007, Warner Bros. and Rowling sued Michigan-based publishing firm RDR Books to block the publication of a 400-page book version of the Harry Potter Lexicon, an online reference guide to her work. Rowling, who previously had a good relationship with Lexicon owner Steve Vander Ark, reiterated on her website that she plans to write a "Harry Potter" encyclopedia, and that the publication of a similar book before her own would hurt the proceeds of the official encyclopedia, which she plans to give to charity. A judge later barred publication of the book in any form until the case was
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