By Euan Rocha and Alastair Sharp TORONTO (Reuters) - When Canada blocked the sale of a fiber optic network to a company backed by an Egyptian telecom tycoon this week, it telegraphed its resolve to make national security paramount when considering whether to allow a foreign firm to acquire what it considers a strategic asset. That warning may effectively limit the pool of would-be buyers of BlackBerry Ltd or foreigners interested in Canada's telecom industry, and it could rule out all but a few well-established players based in North America, industry executives, lawyers and analysts say. ...



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