Giving permission implies giving choice

This article presents the formalisation of the weak and strong permission in deontic logic based ora the logic of enactment. A permission that follows from the absence of a prohibition. we call a weak permission; this permission is not enacted. A strong permission is always enacted (implicitly or explicitly), and implies a gluing choice. The distinction between these two types of pel mission is a consequence of the universality of a normative system by the closure rule: 'whatever is not forbidden, is permitted'.