The Communications Decency Act, or CDA, describes a particular law passed by anal-retentive members of Congress, and a sad time in the history of the Internet. It basically said that no web site in America could have anything remotely offensive on it, unless it had an age verification system. Web pages went down everywhere as right-wingers took over the Internet. Thankfully, the Supreme Court ruled that it was unconstitutional.

See also: censorship