§1. The defense briefs and the observations are to be written unless the judge, with the consent of the parties, considers a debate before a session of the tribunal to be sufficient.
§2. To print the defense briefs along with the principal documents requires the previous permission of the judge, without prejudice to the obligation of secrecy, if such exists.
§3. The regulations of the tribunal are to be observed regarding the length of the defense briefs, the number of copies, and other matters of this kind.
Source: Code of Canon Law (Vatican.va)