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
J. K. Rowling series thus far. The release date was subsequently announced on 10 July 2018, through the Twitter account of Robert Galbraith, to be 18 September 2018. Rowling has said it is unlikely she will write any more books in the "Harry Potter" series. In October 2007 she stated that her future work was unlikely to be in the fantasy genre. On 1 October 2010, in an interview with Oprah Winfrey, Rowling stated a new book on the saga might happen. In 2007, Rowling stated that she planned to write an encyclopaedia of "Harry Potter"s wizarding world consisting of various unpublished material