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It is particularly instructive that the government argued in the Pentagon Papers case that suppression of speech was necessary to preserve secrets relating to cryptography . And this opposition of words is rather to be avoided by silence than to be explained away by speech . Previous court decisions have held that school officials have broad powers to control speech and conduct in schools , such as censoring a student newspaper article on teen pregnancy . Richard encouraged him to talk of the two he could be eloquent on , and Ripton , whose secret vanity was in his powers of speech , never tired of enumerating Lucy 's virtues , and the peculiar attributes of the baby . He became a renowned educator by opening a private normal class to train teachers of speech to the deaf and as a professor of vocal physiology and the mechanics of speech at Boston University . These include the prohibition or censorship of sources that may contain " dangerous " information , restrictions on the electronic speech of unpopular political organisations , and the imposition of " key escrow " or other means of allowing governments to violate privately encrypted correspondence . " And this is the figure of speech called metaphor . This baffling policy is reflected in Bush 's Bondsteel speech , where he burbles on about " a Europe whole and free .