Can. 2 For the most part the Code does not determine the rites to be observed in the celebration of liturgical actions. Accordingly, liturgical laws which have been in effect hitherto retain their force, except those which may be contrary to the canons of the Code.
Can. 3 The canons of the Code do not abrogate, nor do they derogate from, agreements entered into by the Apostolic See with nations or other civil entities. For this reason, these agreements continue in force as hitherto, notwithstanding any contrary provisions of this Code.
Can. 4 Acquired rights, and likewise privileges hitherto granted by the Apostolic See to either physical or juridical persons, which are still in use and have not been revoked, remain intact, unless they are expressly revoked by the canons of this Code.
Can. 5 §1 Universal or particular customs which have been in effect up to now but are contrary to the provisions of these canons and are reprobated in the canons of this Code, are completely suppressed, and they may not be allowed to revive in the future. Other contrary customs are also to be considered suppressed, unless the Code expressly provides otherwise, or unless they are centennial or immemorial: these latter may be tolerated if the Ordinary judges that, in the circumstances of place and person, they cannot be removed.
§2 To the extent that the canons of this Code reproduce the former law, they are to be assessed in the light also of canonical tradition.