57In that regard, an obligation imposed on a service-providing undertaking to provide the Netherlands authorities with information showing that the situation of the workers concerned is lawful as regards matters such as residence, work permit and social coverage in the Member State in which that undertaking employs them would give those authorities, in a less restrictive but just as effective a manner as the requirement for a work permit at issue in the main proceedings, a guarantee that the situation of those workers is lawful and that they are carrying on their main activity in the Member State in which the service-providing undertaking is established (see judgments in Commission v Luxembourg, EU:C:2004:655, paragraph 46, and Commission v Germany, EU:C:2006:49, paragraph 41).
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