The current and future ACC schools apparently have signed a grant of rights agreement that would require any member bolting to another league during the next 14 years to give its share of media money in its new league to the ACC.  I'm sure some cunning commish out there could find a way around it (e.g., the school gets a reduced share of media money but a higher share of merchandising or something else), but it sure shrinks the universe of possibilities for ACC wannabes.

No, the B1G, Pac-12, and Big 12 all have similar agreements. The SEC is the lone major conference without one.

The shocking thing about this is that it was virtually unanimous (I think only Notre Dame, which is only quasi-ACC anyway, isn't on board), since Florida State, Clemson, Georgia Tech, VaTech, UVa, and UNC were all rumored to be entertaining offers from other conferences. Especially Flordia State, which (supposedly) looks at the ACC like WVU looked at the Big East.