Rowling and Warner Bros., the studio behind the movie versions of the books, have filed a lawsuit against US publisher RDR Books over The Harry Potter Lexicon, based on fan Steve Vander Ark's website of the same name, reports Conatctmusic. The book was due for publication in November last year.
On March 24, 2008, a New York Federal District Court Judge ordered the case to go to trial on April 14. A lawyer for RDR Books confirmed that Rowling was expected to appear to give evidence in the case. Rowling herself insists that she plans to write her own definitive Harry Potter encyclopaedia including previously unseen material and will donate the proceeds to charity.