Censorship
When there is freedom of speech and freedom of the press, most information can published.  However, even in developed countries with much freedom of the press, there are some things that cannot be published.  For example, journalists are usually not allowed to publish many secrets about the military, like where troops will be sent on a mission.  Pornography is censored in some countries because it is seen as not moral.  For these reasons, the government might arrest anyone who publishes it.