Why are certain programs pre-empted?
Local broadcasters have the right to require cable operators to black out syndicated programming on distant stations if they own the exclusive local programming rights. For example, a local broadcaster purchases the exclusive local rights to M*A*S*H. The local broadcaster can then force the cable operator to black out M*A*S*H on a broadcast station from outside the market. This regulation, called syndicated exclusivity, is not popular with customers, but cable operators are forced to comply with federal rules.