 In a directive, or regulation, where home state regulation applies, if a firm based in country A is selling into customers living in country B, they are regulated according to the laws of country A.In turn, country B has to accept that the laws of country A are sufficient under the principle of mutual recognition.In the sphere of goods, what these “non-discriminatory” obstacles were and how they were to be removed was clarified in "Cassis" (C-120/78, [1979] ECR 649) and "Keck" (Joined Cases C-267 and 268/91, 1993 [ECR] I-6097) cases of the Court of Justice.