Well, I guess we are both guessing since I assume that neither of us has read the agreement.
But generally speaking, license agreements allow the use of intellectual property under certain conditions. Just like Marvel can't stop Sony from making Spider-Man movies, including all of Spidey's rogue gallery. Marvel would, l'm confident, love to have all of Spider-Man back under their umbrella, but they can't because they licensed it to Sony to make movies.