Famed British author J. K. Rowling says she feels betrayed that one of her fans, coincidentally editor of a very successful Harry Potter website, is trying to publish an unauthorized lexicon focusing on the bespectacled boy wizard.

Steven Vander Ark is editor of the website www.hp-lexicon.org, a site billionaire author J. K. Rowling has praised in the past. Ark has also penned a 400-page book titled “Harry Potter Lexicon,” which he hoped to see published last November via RDR Books, a small Muskegon, Mich., publisher.

Rowling is determined that the dictionary not be published, as she says this is the exact copyright infringement she has been trying to prevent for years.

Papers filed Wednesday in Manhattan read: “I am deeply troubled by the portrayal of my efforts to protect and preserve the copyrights I have been granted in the Harry Potter books,” the Associated Press reports.

Rowling and movie studio Warner Bros., which owns the intellectual property related to the Potter books and movies, brought the lawsuit against Ark and RDR Books in October 2007. The book’s release was put on hold following the legal situation.

The lawsuit seeks to stop publication of the lexicon and also requests damages for copyright and federal trademark infringement and any profits to be gained.

“If RDR’s position is accepted, it will undoubtedly have a significant, negative impact on the freedoms enjoyed by genuine fans on the Internet,” Rowling said. “Authors everywhere will be forced to protect their creations much more rigorously, which could mean denying well-meaning fans permission to pursue legitimate creative activities.”

Rowling, author of the seven massively successful books in the Harry Potter series, has long said she herself intends to write a Harry Potter encyclopedia. She branded Ark’s own effort as exploitative.

“I believe that RDR’s book constitutes a Harry Potter 'rip off' of the type I have spent years trying to prevent, and that both I, as the creator of this world, and fans of Harry Potter, would be exploited by its publication,” she was quoted as saying by Reuters.

Forbes.com placed J. K. Rowling No. 48 in its list of 2007’s most powerful celebrities, with earnings for the June 2006 to June 2007 period estimated at $32 million. She published the last book in the series, “Harry Potter and the Deathly Gallows,” last July. The event created a worldwide furor, with the book selling 11 million copies in the first day of release in the U. K. and U. S.

Ark’s book is based exclusively on Rowling’s writing. As does his website, the lexicon offers comprehensive details on spells and potions found in the books, characters’ full names and biographies, lists of magical creatures etc.

RDR Books publisher Roger Rapoport has said the lexicon is a “critical reference work” that would not compete with Rowling’s own encyclopedia, the AP reports.