39Therefore, a restriction such as that which has been found to exist in the present case is discriminatory. It is compatible with European Union law only if it is covered by an express derogating provision, such as Article 52 TFEU, namely public policy, public security or public health (judgment of 9 September 2010, Engelmann, C‑64/08, EU:C:2010:506, paragraph 34 and the case-law cited).
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