Author J.K. Rowling and Warner Bros., maker of the Harry Potter films and owner of intellectual property rights to the Potter books and movies, sued RDR Books in 2007 to stop the publication of a similar volume by Vander Ark.
A federal judge in New York ruled in favor of Rowling in September, permanently blocking publication of that reference guide. He also awarded Rowling and Warner Bros. Entertainment Inc. $6,750 in statutory damages.
RDR Books appealed the court ruling last month but withdrew the appeal on Thursday.
Vander Ark, a former school librarian who launched The Harry Potter Lexicon Web site in 2000, and his publisher say the new version meets specifications for such a book laid out in the judge's ruling. The author said he spent five or six months working on it following the three-day court hearing in April.
During the trial, the independent publisher did not contest that the lexicon infringes on Rowling's copyright, but argued it was a fair use allowable by law for reference books. The judge ruled Vander Ark went too far.
"We learned a lot at the trial about what was acceptable, what would follow the fair use guidelines," said Vander Ark, 50. "That was not clear before. There was no law on the books that made it clear what was acceptable and what wasn't.
"So, coming out of the trial, I had a much better idea of what should go into the book."
RDR Books Publisher Roger Rapoport said the biggest difference between the two versions is that the new one contains "a lot more critical commentary, which means more analysis."
"It isn't just saying what happens, it's his interpretation of why it's important," Rapoport said.
Vander Ark also removed plot spoilers from his book, in adherence to the decision by U.S. District Judge Robert P. Patterson in New York, Rapoport said.
"We are delighted that this matter is finally and favorably resolved and that J.K. Rowling's rights
- and indeed the rights of all authors of creative works - have been protected," said Neil Blair, a lawyer for Rowling's London-based agent, the Christopher Little Literary Agency. "We are also pleased to hear that rather than continue to litigate, RDR have themselves decided to publish a different book prepared with reference to Judge Patterson's decision."