Can. 8 §1 Universal ecclesiastical laws are promulgated by publication in the ‘Acta Apostolicae Sedis’, unless in particular cases another manner of promulgation has been prescribed. They come into force only on the expiry of three months from the date appearing on the particular issue of the ‘Acta’, unless because of the nature of the case they bind at once, or unless a shorter or a longer interval has been specifically and expressly prescribed m the law itself.
Can. 11 Merely ecclesiastical laws bind those who were baptized in the catholic Church or received into it, and who have a sufficient use of reason and, unless the law expressly provides otherwise, who have completed their seventh year of age.
§3 Without prejudice to the provisions of can. 13, laws enacted for a particular territory bind those for whom they were enacted and who have a domicile or quasidomicile in that territory and are actually residing in it.
2° by the laws of the territory in which they are present, except for those laws which take care of public order, or determine the formalities of legal acts, or concern immovable property located in the territory.
Can. 14 Laws, even invalidating and incapacitating ones, do not oblige when there is a doubt of law. When there is a doubt of fact, however Ordinaries can dispense from them provided, if there is question of a reserved dispensation, it is one which the authority to whom it is reserved Is accustomed to grant.
§2 Ignorance or error is not presumed about a law, a penalty, a fact concerning oneself, or a notorious fact concerning another. It is presumed about a fact concerning another which is not notorious, until the contrary is proved.
§2 An authentic interpretation which is presented by way of a law has the same force as the law itself, and must be promulgated. If it simply declares the sense of words which are certain in themselves, it has retroactive force. If it restricts or extends the law or resolves a doubt, it is not retroactive.
§3 On the other hand, an interpretation by way of a court judgment or of an administrative act in a particular case, does not have the force of law. It binds only those persons and affects only those matters for which it was given.
Can. 17 Ecclesiastical laws are to be understood according to the proper meaning of the words considered in their text and context. If the meaning remains doubtful or obscure, there must be recourse to parallel places, if there be any, to the purpose and circumstances of the law, and to the mind of the legislator.
Can. 19 If on a particular matter there is not an express provision of either universal or particular law, nor a custom, then, provided it is not a penal matter, the question is to be decided by taking into account laws enacted in similar matters, the general principles of law observed with canonical equity, the jurisprudence and practice of the Roman Curia, and the common and constant opinion of learned authors.
Can. 20 A later law abrogates or derogates from an earlier law, if it expressly so states, or if it is directly contrary to that law, or if it integrally reorders the whole subject matter of the earlier law. A universal law, however, does not derogate from a particular or from a special law, unless the law expressly provides otherwise.
Can. 22 When the law of the Church remits some issue to the civil law, the latter is to be observed with the same effects in canon law, insofar as it is not contrary to divine law, and provided it is not otherwise stipulated in canon law.