The estate of author, Adrian Jacobs, filed a copyright suit against Scholastic, Corp., publisher of the widely popular "Harry Potter" series. The trustee of the estate alleged in the suit that the series' author, J.K. Rowling, copied Jacobs' work entitled "The Adventures of Willy the Wizard--No. 1 Livid Land" when she wrote the fourth book, "Harry Potter and the Goblet of Fire.” However, Manhattan-based U.S. District Judge Shira Scheindlin dismissed the case based on the various differences between the books.
Don Jeffrey's BusinessWeek article provides more detail.