Blackout (broadcasting) in the context of "Broadcasting of sports events"

In broadcasting, the term blackout refers to the non-airing of television or radio programming in a certain media market.

It is particularly prevalent in the broadcasting of sports events, although other television or radio programs may be blacked out as well. Most blackout policies serve to protect local broadcasters (primarily regional sports networks) from competition by "out-of-market" networks that carry different teams, by only allowing viewers to watch non-national telecasts of teams within their designated markets (with television providers blacking out regional telecasts of teams that are outside their market; in turn, encouraging viewers to purchase subscription-based out-of-market sports packages), and by allowing teams to black out national telecasts of games that are also being shown by a local broadcaster. In these situations, the national stations would close in those areas for the duration of the game, and in some cases be replaced with other stations until the game ends.