ざいけいほうていしゅ 罪刑法定主義
1. nulla poena sine lege; no punishment without law
Wikipedia definition
2. Nulla poena sine legeNulla poena sine lege (Latin: no penalty without a law) is a legal principle, requiring that one cannot be punished for doing something that is not prohibited by law. This principle is accepted as just and upheld by the penal codes of constitutional states, including virtually all modern democracies. It is related to the principle of "nullum crimen, nulla poena sine praevia lege poenali", which means penal law cannot be enacted retroactively.
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