Toutefois, selon la jurisprudence constante de la Cour de justice, toute restriction à la libre prestation de services doit, comme toutes les dérogations à un principe fondamental du traité, être interprétée de manière restrictive
However, the Court of Justice has consistently held that any restriction on the freedom to provide services, such as any derogation from a fundamental principle of the Treaty, must be interpreted restrictively