First, there are many other public broadcasters who not only reject DRM, but have adopted open licenses (RadioBras in Brazil makes all of its content available under Creative Commons licenses). Second, there is no legal requirement to use DRM under Canadian law. If certain rights holders demand DRM use, the CBC has an alternative. It can reject those demands and choose instead to use only music that rights holders permit to be broadcast without DRM.Link (Thanks, Michael!)
There is no shortage of such music. In addition to the hundreds of thousands of Creative Commons licensed songs and the thousands of classical music recordings in the public domain, the majority of Canadian independent labels reject the use of the DRM. Those labels are responsible for 90 percent of new Canadian music, so it seems to me that the CBC will have lots of Canadian content to choose from in its broadcasts and streams. Most of the music that may require DRM protection is likely that from foreign labels promoting foreign artists. While it would be great to include them in CBC broadcasts, Canada's public broadcaster should be rejecting DRM and moving toward as open a platform as possible. The inclusion of greater Canadian content and the ability to truly meet its mandate to be as accessible as possible to all Canadians make this the obvious path to take.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.