BDU licences cover the rules regarding distributors. So distributors have to carry programming from only these categories. The CRTC actually lists out exactly what foreign signals you can carry and what foreign signals you can't carry. Canada probably has the most prescriptive regulatory regime for BDUs in the world, and it's all kind of laid out there. There are rules regarding distributors and even dealing with things like the transfer of inside wiring, when the customer changes suppliers.
The programming licences of radio stations and TV stations are quite different. They deal with things like how much Canadian content you have to air in prime time, how much local news you have to show, whether you are allowed to be a sports service or a home and garden service. So the kinds of licences are quite different, and it's very simple, in my view, to say the one kind can be owned by foreign entities and the other kind cannot.