After Disney (Marvel) bought Fox I asked a question on whether Marvel own the rights to certain DC characters and someone posted this picture to represent all the characters Marvel (now) has access to.
After a while I noticed long before Fox was sold to Disney that characters such as the X-Men, Wolverine, Sabretooth (pictured below) along Sony Pictures characters such as Venom, Doctor Octopus were frequently used in the cartoon show 'Ultimate Spider-Man (TV series)".
After some research I found the creators of the cartoon are Marvel and the distributors are Disney; Wouldn't they be infringing copyright laws using these characters ?