Canon 1071

Can. 1071 §1. Except in a case of necessity, a person is not to assist without the permission of the local ordinary at:
1º a marriage of transients;
2º a marriage which cannot be recognized or celebrated according to the norm of civil law;
3º a marriage of a person who is bound by natural obligations toward another party or children arising from a previous union;
4º a marriage of a person who has notoriously rejected the Catholic faith;
5º a marriage of a person who is under a censure;
6º a marriage of a minor child when the parents are unaware or reasonably opposed;
7º a marriage to be entered into through a proxy as mentioned in can. 1105.

Can. 1071 §2. The local ordinary is not to grant permission to assist at the marriage of a person who has notoriously rejected the Catholic faith unless the norms mentioned in can. 1125 have been observed with necessary adaptation.