112The right to rely on the principle of the protection of legitimate expectations, which is the corollary of the principle of legal certainty, extends to any individual in a situation where European Union authorities have caused him to entertain legitimate expectations. In whatever form it is given, information which is precise, unconditional and consistent and comes from authorised and reliable sources constitutes assurances capable of giving rise to such expectations. However, a person may not plead infringement of the principle unless he or she has been given precise assurances by the administration. Similarly, if a prudent and alert economic operator can foresee that the adoption of an EU measure is likely to affect his or her interests, he or she cannot plead that principle if the measure is adopted (see, to that effect, the judgment of 17 March 2011, AJD Tuna, C‑221/09, EU:C:2011:153, paragraphs 71 to 73 and the case-law cited).
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