The Supreme Court of Canada issued its decision today in Google Inc. v. Equustek Solutions Inc., 2017 SCC 34, with the majority holding in the 7-2 decision that the trial judge should be given deference in determining an interlocutory injunction, and where it is necessary to ensure the injunction’s effectiveness, a court can grant an injunction enjoining conduct anywhere in the world, including in this case against third-party Google. The underlying proceeding related to passing off and trade secret infringement by a defendant which was conducted outside B.C. through a series of changing websites.
The decision, Google Inc. v. Equustek Solutions Inc. 2017 SCC 34 (link) on appeal from 2015 BCCA 265 and 2014 BCSC 1063. Some select passages from the majority:
 I agree. The problem in this case is occurring online and globally. The Internet has no borders — its natural habitat is global. The only way to ensure that the interlocutory injunction attained its objective was to have it apply where Google operates — globally. As Fenlon J. found, the majority of Datalink’s sales take place outside Canada. If the injunction were restricted to Canada alone or to google.ca, as Google suggests it should have been, the remedy would be deprived of its intended ability to prevent irreparable harm. Purchasers outside Canada could easily continue purchasing from Datalink’s websites, and Canadian purchasers could easily find Datalink’s websites even if those websites were de-indexed on google.ca. Google would still be facilitating Datalink’s breach of the court’s order which had prohibited it from carrying on business on the Internet. There is no equity in ordering an interlocutory injunction which has no realistic prospect of preventing irreparable harm.
 The interlocutory injunction in this case is necessary to prevent the irreparable harm that flows from Datalink carrying on business on the Internet, a business which would be commercially impossible without Google’s facilitation. The order targets Datalink’s websites — the list of which has been updated as Datalink has sought to thwart the injunction — and prevents them from being displayed where they do the most harm: on Google’s global search results.
 This does not make Google liable for this harm. It does, however, make Google the determinative player in allowing the harm to occur. On balance, therefore, since the interlocutory injunction is the only effective way to mitigate the harm to Equustek pending the resolution of the underlying litigation, the only way, in fact, to preserve Equustek itself pending the resolution of the underlying litigation, and since any countervailing harm to Google is minimal to non-existent, the interlocutory injunction should be upheld.
From the dissent:
 As we will explain, the Google Order is effectively final redress against a non-party that has neither acted unlawfully, nor aided and abetted illegal action. The test for interlocutory injunctions established in RJR ― MacDonald Inc. v. Canada (Attorney General),  1 S.C.R. 311, does not apply to an order that is effectively final, and the test for a permanent injunction has not been satisfied. The Google Order is mandatory and requires court supervision. It has not been shown to be effective, and there are alternative remedies available to Equustek.