9 All who, of their own free choice, make use of these media of communications as readers, viewers or listeners have special obligations. For a proper choice demands that they fully favor those presentations that are outstanding for their moral goodness, their knowledge and their artistic or technical merit. They ought, however, to void those that may be a cause or occasion of spiritual harm to themselves, or that can lead others into danger through base example, or that hinder desirable presentations and promote those that are evil. To patronize such presentations, in most instances, would merely reward those who use these media only for profit. In order that those who make use of these media may fulfill the moral code, they ought not to neglect to inform themselves in time about judgments passed by authorities competent in these matters. They ought also to follow such judgments according to the norms of an upright conscience. So that they may more easily resist improper inducements and rather encourage those that are desirable, let them take care to guide and instruct their consciences with suitable aids.
Source: Inter Mirifica (Vatican.va)