12 The public authority, in these matters, is bound by special responsibilities in view of the common good, to which these media are ordered. The same authority has, in virtue of its office, the duty of protecting and safeguarding true and just freedom of information, a freedom that is totally necessary for the welfare of contemporary society, especially when it is a question of freedom of the press. It ought also to encourage spiritual values, culture and the fine arts and guarantee the rights of those who wish to use the media. Moreover, public authority has the duty of helping those projects which, though they are certainly most beneficial for young people, cannot otherwise be undertaken. Lastly, the same public authority, which legitimately concerns itself with the health of the citizenry, is obliged, through the promulgation and careful enforcement of laws, to exercise a fitting and careful watch lest grave damage befall public morals and the welfare of society through the base use of these media. Such vigilance in no wise restricts the freedom of individuals or groups, especially where there is a lack of adequate precaution on the part of those who are professionally engaged in using these media. Special care should be taken to safeguard young people from printed matter and performances which may be harmful at their age.
Source: Inter Mirifica (Vatican.va)