For whoever shall dare to reveal a sin disclosed to him in the tribunal of penance we decree that he shall be not only deposed from the priestly office but that he shall also be sent into the confinement of a monastery to do perpetual penance.Gratian, who compiled the edicts of previous Catholic Ecumenical Councils and the principles of church law, published the Decretum about 1151.
"[6] Pope Pius X in his catechism taught that "the confessor is bound by the seal of confession under the gravest sin and under threat of the severest punishments both temporal and eternal.
[10][11][12][13][14][15][16][excessive citations] According to Roman Catholic canon law, "The sacramental seal is inviolable; therefore it is absolutely forbidden for a confessor to betray in any way a penitent in words or in any manner and for any reason."
[citation needed] Those who are privy to another person's confession either as an interpreter or by accidental circumstance are likewise punished according to the gravity of their delict "not excluding excommunication".
[18] In the Early Modern period, some casuists (inter alia, Thomas Sanchez) justified mental reservation, a form of deception which does not involve outright lying, in specific circumstances including when such an action is necessary to protect secrecy under the seal of the confessional.
However, the Catholic Church punishes with excommunication latae sententiae anyone who records by any technical means or divulges what is said by the confessor or penitent.
[citation needed] In these cases, the priest hearing the confession asks the permission of the penitent to write a petition, using pseudonyms and containing the absolute minimum information necessary, to the bishop or to the Apostolic Penitentiary, the cardinal delegated by the Pope to handle such requests.
This request may be forwarded, sealed, through the apostolic delegate or nuncio in a country (the Pope's ambassador), to be guarded by the privilege of a diplomatic pouch.
In many cases, the rule of evidence of confessional privilege forbids judicial inquiry into communications made under the seal of confession.