Most of the Tokyo’s one are so-called “key station” which provides programs to local countryside radio stations, and Osaka’s are “sub-key station”. Those 13 had formed a IP simulcast council in last December [J]. This move is also supported by giant ad agent Dentsu. They already cleared copyrights issues with rights holders like JASRAC(Japanese Society for Rights of Authors, Composers and Publishers), JAAA(Japan Advertising Agencies Association) and talent agencies, as Nikkei Business says.
This is still a small "ant's hall", but can be the beginning of the end of Japan's old media regime. Dentsu changing their stance about net media has a significant meaning, and if they are pushing the "rights clearing house" scheme for music, it can be a pivotal event in Japan's rigid "copyrights" framework. It could spread over to the video/TV as well. I am curiously watching.