The government is revoking four digital four radio licenses in Montreal, at the request of the CBC: CBME-DR-1, CBM-DR-1, CBF-DR-1 and CBFX-DR-1. Canada chose the European-developed Eureka 147 “out-of-band” DAB system in the late 1990s, but it never spread very far. The first stations went on the air in late 1999, but by 2006, the CRTC regulator began allowing the testing of the U.S.-produced iBiquity HD Radio. To make the adoption hurdle even higher, not only is the Eureka-147 system not compatible with HD Radio, the part of the L-Band spectrum that Canada devoted to digital radio was different from that used in Europe.