49However, when laying down those conditions, Members States must ensure the equal treatment of all workers occupied on their territory as effectively as possible and not penalise workers who exercise their right to freedom of movement (see, to that effect, judgments in Piatkowski, C‑493/04, EU:C:2006:167, paragraph 19; Nikula, C‑50/05, EU:C:2006:493, paragraph 20; and Derouin, C‑103/06, EU:C:2008:185, paragraph 20).
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