Vatican City, Sep 14, 2018 / 04:00 pm (CNA).- Following the allegations made by Archbishop Carlo Maria Viganò about the case of Archbishop Theodore McCarrick, many have called for official Vatican files on the former cardinal to be released. While this may seem like the easiest way of assessing the truth of Viganò’s claims, many of the documents in question could be protected by the “pontifical secret.” But what is that?