Cite as: 521 U. S. 844 (1997)
Opinion of the Court
that it would be prohibitively expensive for noncommercial— as well as some commercial—speakers who have Web sites to verify that their users are adults. Id., at 845-848 (findings 95-116).43 These limitations must inevitably curtail a significant amount of adult communication on the Internet. By contrast, the District Court found that "[d]espite its limitations, currently available user-based software suggests that a reasonably effective method by which parents can prevent their children from accessing sexually explicit and other material which parents may believe is inappropriate for their children will soon be widely available." Id., at 842 (finding 73) (emphases added).
The breadth of the CDA's coverage is wholly unprecedented. Unlike the regulations upheld in Ginsberg and Pacifica, the scope of the CDA is not limited to commercial speech or commercial entities. Its open-ended prohibitions embrace all nonprofit entities and individuals posting indecent messages or displaying them on their own computers in the presence of minors. The general, undefined terms "indecent" and "patently offensive" cover large amounts of non-pornographic material with serious educational or other value.44 Moreover, the "community standards" criterion as applied to the Internet means that any communication avail-43 The Government asserts that "[t]here is nothing constitutionally suspect about requiring commercial Web site operators . . . to shoulder the modest burdens associated with their use." Brief for Appellants 35. As a matter of fact, however, there is no evidence that a "modest burden" would be effective.
44 Transmitting obscenity and child pornography, whether via the Internet or other means, is already illegal under federal law for both adults and juveniles. See 18 U. S. C. §§ 1464-1465 (criminalizing obscenity); § 2251 (criminalizing child pornography). In fact, when Congress was considering the CDA, the Government expressed its view that the law was unnecessary because existing laws already authorized its ongoing efforts to prosecute obscenity, child pornography, and child solicitation. See 141 Cong. Rec. 16026 (1995) (letter from Kent Markus, Acting Assistant Attorney General, U. S. Department of Justice, to Sen. Leahy).
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