Code of Canon Law Can. 1391 The following can be punished with a just penalty, according to the gravity of the offence:
1° a person who composes a false public ecclesiastical document, or who changes or conceals a genuine one, or who uses a false or altered one
2° a person who in an ecclesiastical matter uses some other false oraltered document;
3° a person who, in a public ecclesiastical document, asserts something false.