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The border between Canada and the US is often hailed as the longest undefended border in the world. This is true for the physical border, dotted with sporadic land crossings, and even more so for the digital border, where thousands of strands of fiber span the frontier without any regulation or formality. Since the attacks of September 11, 2001, US authorities have spent untold millions of dollars guarding their frontiers to regulate what gets into the country. On the other side of the border, many Canadian jurisdictions have turned their thoughts to regulating what information flows southward, into the US. This isn't out of concern about terrorism but rather about the US response to terrorism.