Abstract
After stating his position on the concept of "interpretation" and affirming that the ironclad understanding of the traditional principle of legality must give way to the new times, since in language it is ambiguous, polysemic and vague, and explaining his position on the concept of legal property as the axis of the hermeneutics of the special part of the Criminal Code, the author addresses the most salient relationships between civil law and criminal law in the Peruvian legislation on theft in particular, all within the framework of crimes against economic patrimony.