In its Betfair judgment, the Court of Justice ruled that the exclusive license system with respect to games of chance under Dutch law breaches Article 49 of the EC, now: Article 56 of the TFEU, concerning the free movement of services, and in particular the principle of equal treatment and the obligation of transparency. This article addresses the lessons which can be drawn from this judgement and which Dutch legal concepts could be applied to this 'European' obligation of transparency. According to the judgement, this is not only the case for 'public contracts'and 'concessions', but also to licenses under public law. This article addresses the meaning of these legal concepts and discusses to what extent this 'European' obligation of transparency applies to the relevant Dutch legal concepts.