As far as the Marvel properties go, I could be wrong, but I believe the right are non-transferable. I think that in the deal when Fox acquired the Marvel properties, in the case of a sale to another company, the rights revert to Marvel. if someone else knows for sure, say so. But I believe that is deal. So even if Comcast buys Fox, Marvel (Disney) gets back FF, Deadpool, X-men, etc...