I recently got a letter in the mail from Domain Registry of Canada indicating I had to renew 2 domains. Their letter, and envelop is as close as you can get to resembling official Government of Canada letterhead, but isn’t. Actually what then send out in an invoice for services, for which you have not yet even signed up for! But if you return the letter with payment you are in fact agreeing to switch your business over to them!
So what or who is Domain Registry of Canada exactly? They are merely a domain registrar, a company that offer the service of registering your website address (your .com, .ca, .net, …).