Anti-siphoning law
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Anti-Siphoning laws are designed to prevent pay-TV broadcasters (pay-per-view or 'premium channels' for example) from buying monopoly rights to televise important and culturally significant events before free-to-air television (commercial supported television, such as NBC, ABC, CBS and FOX in the United States) has a chance to bid on them. The theory is that if such a monopoly was allowed, then the poor would be unable to view the important and cultural significant acts.
Generally the laws allow pay-tv to bid purchase such monopoly rights only if free-to-air television has declined to bid on them.
Australia's Broadcasting Services Act 1992 is an example of an Anti-Siphoning law.