54In that respect, several interested parties which submitted observations to the Court referred to Article 49 of the Charter of Fundamental Rights of the European Union (‘the Charter’) which enshrines the principles of legality and proportionality of criminal offences and penalties, according to which, inter alia, no one is to be held guilty of any criminal offence on account of any act or omission which did not constitute a criminal offence under national law or international law at the time when it was committed.
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