The Free On-line Dictionary of Computing (30 December 2018):

Communications Decency Act

    (CDA) An amendment to the U.S. 1996 Telecommunications
   Bill that went into effect on 1996-02-08.  The law, originally
   proposed by Senator James Exon to protect children from
   obscenity on the Internet, ended up making it punishable by
   fines of up to $250,000 to post indecent language on the
   Internet anywhere that a minor could read it.

   Thousands of outraged Internet users turned their web
   pages black in protest or displayed the Electronic Frontier
   Foundation's special icons.

   On 1996-06-12, a three-judge panel in Philadelphia ruled the
   CDA unconstitutional and issued an injunction against the
   United States Justice Department forbidding them to enforce
   the "indecency" provisions of the law.  Internet users
   celebrated by displaying an animated "Free Speech" fireworks
   icon to their web pages, courtesy of the Voters
   Telecommunications Watch.  The Justice Department appealed
   the decision to the U.S. Supreme Court.

   (1996-11-03)