No need to learn anything. Rome accepts them. They accepted Campos' marriages by supplied jurisdiction without so much as a blink of an eye. SSPX is in exactly the same situation. You are whistling in the dark.
The Sacraments of Penance and Matrimony, however, require that the priest enjoys the faculties of the diocese or has proper delegation. Since that is not the case with these priests, these sacraments are invalid. It remains true, however, that, if the faithful are genuinely ignorant that the priests of the Society of St. Pius X do not have the proper faculty to absolve, the Church supplied these faculties so that the sacrament was valid. (Msgr. Perl, Ecclesia Dei Commission, Prot.N. 539/99)
They accepted Campos' marriages
- Sanatio in radice, at least ad cautelam, of the marriages already celebrated by the priests of the Society without the required delegation. (1988 Protocol of Agreement between the Vatican and Msgr. Lefebvre)
Can. 1161 §1 The retroactive validation of an invalid marriage is its validation without the renewal of consent, granted by the competent authority. It involves a dispensation from an impediment if there is one and from the canonical form if it had not been observed, as well as a referral back to the past of the canonical effects.
§2 The validation takes place from the moment the favour is granted; the referral back, however, is understood to have been made to the moment the marriage was celebrated, unless it is otherwise expressly provided.Can. 1164 A retroactive validation may validly be granted even if one or both of the parties is unaware of it; it is not, however, to be granted except for a grave reason.