As much as I dislike government bureaucracy and decision making, this time it's not the CRTC that's the bad guy.
Below is the response from the CRTC last fall when I asked them about the issue:
This is in response to your correspondence of November 12, 2012.
The CRTC has not issued any ruling requiring satellite TV distributors to block their signals from customers across the border. The matter is one of licensing, in that the Commission is only able to grant a license to a company for distribution in Canada. The same applies to those in the U.S. - each distributor is licensed to do business in a given area. This means that companies have not acquired the rights to broadcast the programming feeds outside of their territory. Broadcasters enter into private agreements with respect to the distribution of their signals and programming rights - and then apply for licenses accordingly.
Since neither Bell TV nor Shaw Direct are likely licensed by the FCC to provide their services in the United States, it was probably a business decision by Bell TV to take whatever action is necessary to ensure it is operating within the law. Furthermore, there is nothing to prevent U.S.-licensed services - whether satellite or cable - from contracting to various Canadian channels for distribution in the United States. Again, that would be a business decision of TV service providers in the U.S.
It sounds like a licensing issue