User blog comment:Craiglpalmer/SOPA and PIPA Situation Summary/@comment-3528888-20120118000714/@comment-3528888-20120118001757

it defines US property as any internet domain given by a company inside the United states, and ARIN, the Internet registry for ALL of North America is in the USA, as such the legislation of SOPA and PIPA regard the .ca and .gc domains as US property and thus the USA establishes authority over canadian domains