Canon 845

1. If the impediment is a public one, the consent is to be

renewed by both parties according to the form for the celebration

of marriage required by law. 2. If the impediment is occult,

it is sufficient that the consent be renewed privately and in

secret by the party who is aware of the impediment, provided the

other party perseveres in the consent already given, or by both

parties when each of them knows about the impediment.