 Even without historical precedent, Fox negotiated deals with a handful of advertisers in case overtime were to occur.Canadian broadcast rights to Super Bowl LI were subject to a still-ongoing legal dispute; although U.S. network affiliates are carried by pay TV providers in the country, Canadian law grants domestic broadcast stations the right to require that these signals be substituted with their own if they are carrying the same program in simulcast with a U.S. station ("simsub").This policy is intended to help protect Canadian advertising revenue from being lost to viewers watching via U.S. feeds of a program.