§1. Except for a just and reasonable cause, the Christian faithful are not to write anything for newspapers, magazines, or periodicals which are accustomed to attack openly the Catholic religion or good morals; clerics and members of religious institutes, however, are to do so only with the permission of the local ordinary.
§2. It is for the conference of bishops to establish norms concerning the requirements for clerics and members of religious institutes to take part on radio or television in dealing with questions of Catholic doctrine or morals.
Source: Code of Canon Law (Vatican.va)