If you want to learn more, read "The Regulation of Pornography and Child Pornography on the Internet" by Yaman Akdeniz, published in February 1997 and available at: www.leeds.ac.uk/law/pgs/yaman/child.htm This is by far the most relevant and revealing essay on this matter (covers bibliography and further links).
You may also read the opinion of the District Court for the Eastern District of Pennsylvania in American Civil Liberties Union et al vs. Janet Reno, Attorney General of the United States.
And American Library Association, Inc., et al. vs. United States Department of Justice on the notorious Congressional Decency Act (CDA), to be found at:www.soci.niu.edu/~cudigest/cda/cdadec1 This is really a huge one (about 250 kB pure text).
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