Accessibility
The archives of the Congregations are not opened to the public. If one wishes to study the documents, he should ask permission from the authorities of the Congregations. Ordinarily it is sufficient to ask it of the secretary; in the Congregations of Propaganda and of the Index the petition should be addressed to the Cardinal Prefect, and in the Congregation of the Holy Office, to the Congregation itself; finally, in the Congregation of Extraordinary Ecclesiastical Affairs, the matter has to be referred to the Pope. When there are sufficient reasons, which should be more or less grave according to the quality of the matter, the petitioner either will be allowed to inspect the original documents or will be supplied with authentic copies.
Read more about this topic: Acts Of Roman Congregations