It's been said that superpowers aren't required to be a superhero. Now, a trademark challenge brought on behalf of a children's book author means that permission from Marvel or DC Comics is no longer required, either. 

The U.S. Patent and Trademark Office's Trademark Trial and Appeal Board in Alexandria, Virginia, last week canceled Marvel Characters and DC Comics' joint registrations on the terms "super hero" and "super heroes." The board issued a default judgment after the respondents failed to file an answer to the petitioner's motion.