100Second, since HTTS did not contest the legality of Regulation No 668/2010 by means of an action for annulment, it was for it to demonstrate that that regulation was unlawful, in the action giving rise to the judgment under appeal. Acts of the EU institutions are in principle presumed to be lawful and accordingly produce legal effects until such time as they are withdrawn, annulled in an action for annulment or declared invalid following a reference for a preliminary ruling or a plea of illegality (see, to that effect, judgment of 6 October 2015, Schrems, C‑362/14, EU:C:2015:650, paragraph 52).
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