29As the Advocate General observed, in essence, in points 28 and 32 to 34 of his Opinion, this results in a flexible definition of the concept of ‘establishment’, which departs from a formalistic approach whereby undertakings are established solely in the place where they are registered. Accordingly, in order to establish whether a company, the data controller, has an establishment, within the meaning of Directive 95/46, in a Member State other than the Member State or third country where it is registered, both the degree of stability of the arrangements and the effective exercise of activities in that other Member State must be interpreted in the light of the specific nature of the economic activities and the provision of services concerned. This is particularly true for undertakings offering services exclusively over the Internet.
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