50In that regard, an obligation imposed on a service-providing undertaking to provide the Austrian authorities with information showing that the situation of the workers who are third-country nationals is lawful, inter alia in terms of 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, to that effect, judgment of 11 September 2014, Essent Energie Productie, C‑91/13, EU:C:2014:2206, paragraph 57).
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