Implied rights are the political and civil freedoms that necessarily underlie the actual words of the constitution but are not themselves expressly stated directly in the constitution. The High Court has held that no implication can be drawn from the Constitution which is not based on the actual terms of the Constitution, or on its structure. Since the 1990s the High Court has discovered rights which are said to be implied by the very structure and textual form of the Constitution. Chief amongst these is an implied right to freedom of communication on political matters. In addition, some protections of civil liberties have been the result of the High Court's zealous attempts to safeguard the independence of, and confidence in, the Federal judiciary.