Modern man cannot do without information that is full, consistent, accurate and true. Without it, he cannot understand the perpetually changing world in which he lives nor be able to adapt himself to the real situation. This adaptation calls for frequent decisions that should be made with a full knowledge of events. Only in this way can he assume a responsible and active role in his community and be a part of its economic, political, cultural and religious life.
With the right to be informed goes the duty to seek information. Information does not simply occur; it has to be sought. On the other hand, in order to get it, the man who wants information must have access to the varied means of social communication. In this way he can freely choose whatever means best suit his needs both personal and social. It is futile to talk about the right to information if a variety of the sources for it are not made available.
And the Vatican again, this time in 1971 in a Pastoral Instruction called Communio Et Progressio.