Can. 1645

§1. Restitutio in integrum is granted against a sentence which has become res iudicata provided that its injustice is clearly established.

§2. Injustice, however, is not considered to be established clearly unless: 1/ the sentence is based on proofs which afterwards are discovered to be false in such a way that without those proofs the dispositive part of the sentence is not sustained; 2/ documents have been revealed afterwards which undoubtedly prove new facts and demand a contrary decision; 3/ the sentence was rendered due to the malice of one party resulting in harm to the other party; 4/ a prescript of the law which is not merely procedural was clearly neglected; 5/ the sentence is contrary to a previous decision which has become res iudicata.