I think we're looking at an act that was devised basically beginning in 1985, before the Internet had become more than a gleam in Al Gore's eye. At that time, the idea was that transmissions were coming from the United States, even from Mexico, and Parliament wanted to ensure that it had control over its sovereign territory, including the transmission of signals. Perhaps that's because Parliament wanted to ensure that Canadian programming that was being transmitted was available to all Canadians. Also, perhaps it wanted to ensure that it could control the content that was available.
These days, however, the legislation is still intact, and Parliament has chosen not to say, “All you're going to control is programming that takes place in its totality within Canada.” Having distinguished between “in whole or in part”, it's up to the courts, to some extent, to decide what that “in part” means. I think common sense—