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pervasiveness doctrine
In broadcast law (particularly within U.S. law), the pervasiveness doctrine is the doctrine that because broadcast radio waves are available to anyone and therefore "uniquely pervasive", their content is subject to regulation. In general, profanity and sex, or other adult material deemed "indecent" by a broadcasting authority may not be broadcast outside of overnight "watershed" or "safe harbor" hours when children are unlikely to be awake. Material deemed "obscene" may still be prohibited at all times.
This has generally been held to only apply to the AM broadcast band (mediumwave), FM broadcast band (VHF band II), and TV broadcast bands (VHF band I and band III, and UHF). It does not apply to cable TV, cable radio, satellite TV, satellite radio, or other forms of electronic media, because although they also use publicly owned airwaves, these are subscription services which the listener or viewer must explicitly request, and are subject to conditional access, analog scrambling, or digital encryption.
The origin of the name comes from the Federal Communications Commission's 1978 legal case against Pacifica Radio, when the U.S. Supreme Court used the term to justify the verdict against the broadcaster. The ''Federal Communications Commission v. Pacifica Foundation'' case is considered a landmark for American broadcasters.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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