I find the copyright and trademark information to be confusing: "Harry Potter and Pottermore Publishing Rights © J.K. Rowling. Harry Potter characters, names a

I find the copyright and trademark information to be confusing: "Harry Potter and Pottermore Publishing Rights © J.K. Rowling. Harry Potter characters, names and related indicia are trademarks of and © Warners Bros. Ent. All Rights Reserved." So she owns the publishing rights to Harry Potter and she created everything about the series (names, places, characters) but somehow Warner Bros. owns the trademarks and copyright for the characters and names? Seems like she may have had to relinquish (or sell, rather) a lot of rights to get those movies made.