marvelmadness13
Senior Member
Think about it this way. If you sell me a temporary license to use your character, Cool Guy Man, in a movie, that contract is going to have stipulations and obligations that I need to be in line with or I'm breaching the contract and I forfeit the rights. Suppose a year later you sell me another temporary license for your "Awesome Dude" franchise, again the contract os going to have rules I have to follow.
The problem is this, if I make a Cool Guy Man vs Awesome Dude movie, I would have to choose which contracts rules to follow, which would mean I'm violating the rules of the contract I don't follow, which means I lose those rights. You, as the owner of CGM and AD would have to give me a new contract telling me limits and obligations on this new combined franchise, and Disney sure as hell doesn't want Fox trying to take a slice of Avengers style combined universe pie.
Owning the film rights to a franchise gives you just that, the rights to make a film based on that franchise. Owning the film rights to a property that another company owns the IP for doesn't grant you free reign with it, for example even though they own the rights to both they can't have Xenomorphs in the next X-men film.