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
The Magical Worlds of Harry Potter in March 2001 and hired a company to take care of accounting, marketing, promotion, and selling. Colbert has never met Rowling and the book has not been approved by her or Warner Brothers (the owner of the film rights to the "Harry Potter" novels). He was given permission to publish it as long as he noted on the cover that it had not been approved by Rowling. The book has been met with positive reactions from critics. Margie Thomson of "The New Zealand Herald" commented that "it's interesting, although light, and should keep smart-alecky kids and the truly curious happy