I found a literary copyright infringement case in February 2010 that involves JK Rowling's Harry Potter series. Adrian Jacobs accused Rowling of stealing some of her ideas for Harry Potter and the Goblet of Fire from his 36-page book The Adventures of Willy the Wizard. Jacob claimed that Rowling stole the idea for Harry to solve a task for a contest which he finds in the bathroom with other peoples help. He claims that she stole a lot more ideas then that from his books for the other Harry Potter books as well. Later JK Rowling was released of all charges since she was found not guilty.
http://www.guardian.co.uk/books/2010/feb/18/harry-potter-jk-rowling-willy-wizard