03/02/2020 Reno v. American Civil Liberties Union, 117 S.Ct. 2329, 138 L.Ed.2d 874 (1997) traditional program content in order to designate when--rather than whether--it would be permissible to air such a program in that particular medium. The CDA's broad categorical prohibitions are not limited to particular times and are not dependent on any evaluation by an agency familiar with the unique characteristics of the Internet. Second, unlike the CDA, the Commission's declaratory order was not punitive; we expressly refused to decide whether the indecent broadcast "would justify a criminal prosecution." Id., at 750. Finally, the Commission's order applied to a medium which as a matter of history had "received the most limited First Amendment protection," id., at 748, in large part because warnings could not adequately protect the listener from unexpected program content. The Internet, however, has no comparable history. Moreover, the District Court found that the risk of encountering indecent material by accident is remote because a series of affirmative steps is required to access specific material. In Renton, we upheld a zoning ordinance that kept adult movie theatres out of residential neighborhoods. The ordinance was aimed, not at the content of the films shown in the theaters, but rather at the "secondary effects"--such as crime and deteriorating property values--that these theaters fostered: " `It is th[e] secondary effect which these zoning ordinances attempt to avoid, not the dissemination of "offensive" speech.' " 475 U. S., at 49 (quoting Young v. American Mini Theatres, Inc., 427 U.S. 50, 71, n. 34 (1976)). According to the Government, the CDA is constitutional because it constitutes a sort of "cyberzoning" on the Internet. But the CDA applies broadly to the entire universe of cyberspace. And the purpose of the CDA is to protect children from the primary effects of "indecent" and "patently offensive" speech, rather than any "secondary" effect of such speech. Thus, the CDA is a content based blanket restriction on speech, and, as such, cannot be "properly analyzed as a form of time, place, and manner regulation." 475 U. S., at 46. See also Boos v. Barry, 485 U.S. 312, 321 (1988) ("Regulations that focus on the direct impact of speech on its audience" are not properly analyzed under Renton); Forsyth County v. Nationalist Movement, 505 U.S. 123, 134 (1992) ("Listeners' reaction to speech is not a content neutral basis for regulation"). These precedents, then, surely do not require us to uphold the CDA and are fully consistent with the application of the most stringent review of its provisions. In Southeastern Promotions, Ltd. v. Conrad, 420 U.S. 546, 557 (1975), we observed that "[e]ach medium of expression . . . may present its own problems." Thus, some of our cases have recognized special justifications for regulation of the broadcast media that are not applicable to other speakers, see Red Lion Broadcasting Co. v. FCC, 395 U.S. 367 (1969); FCC v. Pacifica Foundation, 438 U.S. 726 (1978). In these cases, the Court relied on the history of extensive government regulation of the broadcast medium, see, e.g., Red Lion, 395 U. S., at 399-400; the scarcity of available frequencies at its inception, see, e.g., https://www.law.cornell.edu/supct/html/96-511.ZO.html 11/29