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 information on characters, places and objects in the "Harry Potter" universe. In October 2015, Rowling announced via "Pottermore" that a two-part play she had co-authored with playwrights Jack Thorne and John Tiffany, "Harry Potter and the Cursed Child", was the "eighth "Harry Potter" story" and that it would focus on the life of Harry Potter's youngest son Albus after the epilogue of "Harry Potter and the Deathly Hallows". On 28 October 2015, the first round of tickets went on sale and sold out in several hours. In 2000, Rowling established the Volant Charitable Trust, which uses its annual budget of