The CBC's funding is supplemented by revenue from commercial advertising on its television broadcasts. The radio service employed commercials from its inception to 1974, but since then its primary radio networks have been commercial-free. In 2013, the CBC's secondary radio networks, CBC Music and , introduced limited advertising of up to four minutes an hour, but this was discontinued in 2016.
the cbc's funding is supplemented by revenue from commercial advertising on its television broadcasts the radio service employed commercials from its inception to 1974 but since then its primary radio networks have been commercial-free in 2013 the cbc's secondary radio networks cbc music and  introduced limited advertising of up to four minutes an hour but this was discontinued in 2016