There are. For instance, Marvel retained full control of animated Spider-Man TV rights, if I'm not mistaken, while Sony got nothing.
Hence why Agent Coulson himself popped up in Ultimate Spider-man rather quickly.
Sony had the Spider-Man animation rights. That's why Spectacular Spider-Man exists. When Marvel got the animation rights, they cancelled Spectacular and created Ultimate. Because they were never going to pay to produce a cartoon that they didn't own.