from wikipedia
Pre-2005
The Canadian counterpart of RadioShack, also known as Radio Shack, was run by a company called InterTAN, acquired in 2004 by Circuit City. However, RadioShack sued InterTAN one week after the purchase, claiming InterTAN had breached the terms of their agreement. On March 24, 2005, a U.S. district court judge ruled in favor of RadioShack and cancelled their agreement, meaning that all 950 RadioShack stores in Canada must stop using the brand name in any of their products, packaging or advertising by June 30, 2005. As a result, all of the InterTAN stores were rebranded under the name The Source by Circuit City and RadioShack Corporation plans to open its own stores in Canada under the RadioShack name.
Post-2005
After preventing InterTAN from using the RadioShack trademark, RadioShack announced its intention to re-enter the Canadian market itself with a Canadian division. InterTAN is pursuing court action to prevent RadioShack from using the trademark in Canada until the original 2010 expiry date of the original licensing agreement. The company had planned to have 20 to 30 stores operating in Canada as RadioShack by the end of 2005, mostly in the Toronto area, but progress has been slower than this. As of September, 2006, nine company owned stores had been opened and 16 dealer stores were operating under the name RadioShack, signing new agreements with RadioShack Corporation.
In December 2006, RadioShack Corporation announced that it will close its nine company-owned stores in Canada by the end of January 2007 as the company focuses its attention and resources on strengthening its core business in the U.S.