High Quality Content by WIKIPEDIA articles! Simultaneous substitution (known also as simsubbing or signal substitution) is a sometimes controversial practice mandated by the Canadian Radio-television and Telecommunications Commission (CRTC) requiring Canadian cable, direct broadcast satellite and multichannel multipoint distribution service television distribution companies to substitute the signal of a foreign or non-local television station with the signal of a local or regional over-the-air station when the two stations are airing identical programming simultaneously.
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