Can. 27

§ 1. Iuri divino sive naturali sive positivo nulla consuetudo potest aliquatenus derogare; sed neque iuri ecclesiastico praeiudicium affert, nisi fuerit rationabilis et legitime per annos quadraginta continuos et completos praescripta; contra legem vero ecclesiasticam quae clausulam contineat futuras consuetudines prohibentem, sola praescribere potest rationabilis consuetudo centenaria aut immemorabilis.

§ 2. Consuetudo quae in iure expresse reprobatur non est rationabilis.

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