Justice Kennedy delivered the opinion of the Court.
This case presents a challenge to a statute enacted by Congress to protect minors from exposure to sexually explicit materials on the Internet, the Child Online Protection Act (COPA). We must decide whether the Court of Appeals was correct to affirm a ruling by the District Court that enforcement of COPA should be enjoined because the statute likely violates the First Amendment.
In enacting COPA, Congress gave consideration to our earlier decisions on this subject, in particular the decision in Reno v. ACLU (1997). For that reason, "the Judiciary must proceed with caution and . . . with care before invalidating the Act." The imperative of according respect to the Congress, however, does not permit us to depart from well-established First Amendment principles. Instead, we must hold the Government to its constitutional burden of proof.
Content-based prohibitions, enforced by severe criminal penalties, have the constant potential to be a repressive force in the lives and thoughts of a free people. To guard against that threat the Constitution demands that content-based restrictions on speech be presumed invalid, and that the Government bear the burden of showing their constitutionality. . . .
[T]he Court of Appeals was correct to conclude that the District Court did not abuse its discretion in granting the preliminary injunction. The Government has failed, at this point, to rebut the plaintiffs' contention that there are plausible less restrictive alternatives to the statute. . . .
I
COPA is the second attempt by Congress to make the Internet safe for minors by criminalizing certain Internet speech. The first attempt was the Communications Decency Act of 1996. The Court held the CDA unconstitutional because it was not narrowly tailored to serve a compelling governmental interest and because less restrictive alternatives were available.
In response to the Court's decision in Reno, Congress passed COPA. COPA imposes criminal penalties of a $50,000 fine and six months in prison for the knowing posting, for "commercial purposes," of World Wide Web content that is "harmful to minors." Material that is "harmful to minors" is defined as:
"any communication, picture, image, graphic image file, article, recording, writing, or other matter of any kind that is obscene or that--
"(A) the average person, applying contemporary community standards, would find, taking the material as a whole and with respect to minors, is designed to appeal to, or is designed to pander to, the prurient interest;
"(B) depicts, describes, or represents, in a manner patently offensive with respect to minors, an actual or simulated sexual act or sexual contact, an actual or simulated normal or perverted sexual act, or a lewd exhibition of the genitals or post-pubescent female breast; and
"(C) taken as a whole, lacks serious literary, artistic, political, or scientific value for minors." . . .
A person may escape conviction under the statute by demonstrating that he
"has restricted access by minors to material that is harmful to minors--
"(A) by requiring use of a credit card, debit account, adult access code, or adult personal identification number;
"(B) by accepting a digital certificate that verifies age, or
"(C) by any other reasonable measures that are feasible under available technology."
Since the passage of COPA, Congress has enacted additional laws regulating the Internet in an attempt to protect minors. For example, it has enacted a prohibition on misleading Internet domain names, in order to prevent Web site owners from disguising pornographic Web sites in a way likely to cause uninterested persons to visit them. It has also passed a statute creating a "Dot Kids" second-level Internet domain, the content of which is restricted to that which is fit for minors under the age of 13. . . .
II
"This Court, like other appellate courts, has always applied the abuse of discretion standard on the review of a preliminary injunction." . . . If the underlying constitutional question is close, therefore, we should uphold the injunction and remand for trial on the merits. Applying this mode of inquiry, we agree with the Court of Appeals that the District Court did not abuse its discretion in entering the preliminary injunction. . . .
A statute that "effectively suppresses a large amount of speech that adults have a constitutional right to receive and to address to one another . . . is unacceptable if less restrictive alternatives would be at least as effective in achieving the legitimate purpose that the statute was enacted to serve." When plaintiffs challenge a content-based speech restriction, the burden is on the Government to prove that the proposed alternatives will not be as effective as the challenged statute.
In considering this question, a court assumes that certain protected speech may be regulated, and then asks what is the least restrictive alternative that can be used to achieve that goal. The purpose of the test is not to consider whether the challenged restriction has some effect in achieving Congress' goal, regardless of the restriction it imposes. The purpose of the test is to ensure that speech is restricted no further than necessary to achieve the goal, for it is important to assure that legitimate speech is not chilled or punished. For that reason, the test does not begin with the status quo of existing regulations, then ask whether the challenged restriction has some additional ability to achieve Congress' legitimate interest. Any restriction on speech could be justified under that analysis. Instead, the court should ask whether the challenged regulation is the least restrictive means among available, effective alternatives.
In deciding whether to grant a preliminary injunction stage, a district court must consider whether the plaintiffs have demonstrated that they are likely to prevail on the merits. As the Government bears the burden of proof on the ultimate question of COPA's constitutionality, respondents must be deemed likely to prevail unless the Government has shown that respondents' proposed less restrictive alternatives are less effective than COPA. Applying that analysis, the District Court concluded that respondents were likely to prevail. That conclusion was not an abuse of discretion, because on this record there are a number of plausible, less restrictive alternatives to the statute.
The primary alternative considered by the District Court was blocking and filtering software. Blocking and filtering software is an alternative that is less restrictive than COPA, and, in addition, likely more effective as a means of restricting children's access to materials harmful to them. . . .
Filters are less restrictive than COPA. They impose selective restrictions on speech at the receiving end, not universal restrictions at the source. Under a filtering regime, adults without children may gain access to speech they have a right to see without having to identify themselves or provide their credit card information. Even adults with children may obtain access to the same speech on the same terms simply by turning off the filter on their home computers. Above all, promoting the use of filters does not condemn as criminal any category of speech, and so the potential chilling effect is eliminated, or at least much diminished. All of these things are true, moreover, regardless of how broadly or narrowly the definitions in COPA are construed.
Filters also may well be more effective than COPA. First, a filter can prevent minors from seeing all pornography, not just pornography posted to the Web from America. The District Court noted in its factfindings that one witness estimated that 40% of harmful-to-minors content comes from overseas. COPA does not prevent minors from having access to those foreign harmful materials. That alone makes it possible that filtering software might be more effective in serving Congress' goals. Effectiveness is likely to diminish even further if COPA is upheld, because the providers of the materials that would be covered by the statute simply can move their operations overseas. It is not an answer to say that COPA reaches some amount of materials that are harmful to minors; the question is whether it would reach more of them than less restrictive alternatives. In addition, the District Court found that verification systems may be subject to evasion and circumvention, for example by minors who have their own credit cards. Finally, filters also may be more effective because they can be applied to all forms of Internet communication, including e-mail, not just communications available via the World Wide Web.
That filtering software may well be more effective than COPA is confirmed by the findings of the Commission on Child Online Protection, a blue-ribbon commission created by Congress in COPA itself. Congress directed the Commission to evaluate the relative merits of different means of restricting minors' ability to gain access to harmful materials on the Internet. It unambiguously found that filters are more effective than age-verification requirements. . . .
Filtering software, of course, is not a perfect solution to the problem of children gaining access to harmful-to-minors materials. It may block some materials that are not harmful to minors and fail to catch some that are. Whatever the deficiencies of filters, however, the Government failed to introduce specific evidence proving that existing technologies are less effective than the restrictions in COPA. . . .
One argument . . . is worth mentioning--the argument that filtering software is not an available alternative because Congress may not require it to be used. That argument carries little weight, because Congress undoubtedly may act to encourage the use of filters. We have held that Congress can give strong incentives to schools and libraries to use them. It could also take steps to promote their development by industry, and their use by parents. It is incorrect, for that reason, to say that filters are part of the current regulatory status quo. The need for parental cooperation does not automatically disqualify a proposed less restrictive alternative. In enacting COPA, Congress said its goal was to prevent the "widespread availability of the Internet" from providing "opportunities for minors to access materials through the World Wide Web in a manner that can frustrate parental supervision or control." COPA presumes that parents lack the ability, not the will, to monitor what their children see. By enacting programs to promote use of filtering software, Congress could give parents that ability without subjecting protected speech to severe penalties.. . .
[I]t is important to note that this opinion . . . does not foreclose the District Court from concluding, upon a proper showing by the Government that meets the Government's constitutional burden as defined in this opinion, that COPA is the least restrictive alternative available to accomplish Congress' goal.
On this record, the Government has not shown that the less restrictive alternatives proposed by respondents should be disregarded. Those alternatives, indeed, may be more effective than the provisions of COPA. The District Court did not abuse its discretion when it entered the preliminary injunction. The judgment of the Court of Appeals is affirmed, and the case is remanded for proceedings consistent with this opinion.
It is so ordered.
Justice Scalia, dissenting.
I agree with Justice Breyer's conclusion that the Child Online Protection Act (COPA) is constitutional. Both the Court and Justice Breyer err, however, in subjecting COPA to strict scrutiny. Nothing in the First Amendment entitles the type of material covered by COPA to that exacting standard of review. "We have recognized that commercial entities which engage in 'the sordid business of pandering' by 'deliberately emphasiz[ing] the sexually provocative aspects of [their nonobscene products], in order to catch the salaciously disposed,' engage in constitutionally unprotected behavior."
There is no doubt that the commercial pornography covered by COPA fits this description. . . . Since this business could, consistent with the First Amendment, be banned entirely, COPA's lesser restrictions raise no constitutional concern.
Justice Breyer, with whom the Chief Justice and Justice O'Connor join, dissenting.
The Child Online Protection Act (Act), seeks to protect children from exposure to commercial pornography placed on the Internet. It does so by requiring commercial providers to place pornographic material behind Internet "screens" readily accessible to adults who produce age verification. The Court recognizes that we should "'proceed . . . with care before invalidating the Act,'" while pointing out that the "imperative of according respect to the Congress . . . does not permit us to depart from well-established First Amendment principles." I agree with these generalities. Like the Court, I would subject the Act to "the most exacting scrutiny," requiring the Government to show that any restriction of nonobscene expression is "narrowly drawn" to further a "compelling interest" and that the restriction amounts to the "least restrictive means" available to further that interest.
Nonetheless, . . . the Court is wrong. I cannot accept its conclusion that Congress could have accomplished its statutory objective--protecting children from commercial pornography on the Internet--in other, less restrictive ways.
I
Although the Court rests its conclusion upon the existence of less restrictive alternatives, I must first examine the burdens that the Act imposes upon protected speech. That is because the term "less restrictive alternative" is a comparative term. An "alternative" is "less restrictive" only if it will work less First Amendment harm than the statute itself, while at the same time similarly furthering the "compelling" interest that prompted Congress to enact the statute. . . .
The Act's definitions limit the material it regulates to material that does not enjoy First Amendment protection, namely legally obscene material, and very little more. . . .
These limitations on the statute's scope answer many of the concerns raised by those who attack its constitutionality. Respondents fear prosecution for the Internet posting of material that does not fall within the statute's ambit as limited by the "prurient interest" and "no serious value" requirements; for example: an essay about a young man's experience with masturbation and sexual shame; "a serious discussion about birth control practices, homosexuality, . . . or the consequences of prison rape"; an account by a 15-year-old, written for therapeutic purposes, of being raped when she was 13; a guide to self-examination for testicular cancer; a graphic illustration of how to use a condom; or any of the other postings of modern literary or artistic works or discussions of sexual identity, homosexuality, sexually transmitted diseases, sex education, or safe sex, let alone Aldous Huxley's Brave New World, J. D. Salinger's Catcher in the Rye, or, as the complaint would have it, "Ken Starr's report on the Clinton-Lewinsky scandal."
These materials are not both (1) "designed to appeal to, or . . . pander to, the prurient interest" of significant groups of minors and (2) lacking in "serious literary, artistic, political, or scientific value" for significant groups of minors. Thus, they fall outside the statute's definition of the material that it restricts . . .
The Act does not censor the material it covers. Rather, it requires providers of the "harmful to minors" material to restrict minors' access to it by verifying age. They can do so by inserting screens that verify age using a credit card, adult personal identification number, or other similar technology. In this way, the Act requires creation of an internet screen that minors, but not adults, will find difficult to bypass. . . .
In sum, the Act at most imposes a modest additional burden on adult access to legally obscene material, perhaps imposing a similar burden on access to some protected borderline obscene material as well.
II
I turn next to the question of "compelling interest," that of protecting minors from exposure to commercial pornography. No one denies that such an interest is "compelling." Rather, the question here is whether the Act, given its restrictions on adult access, significantly advances that interest. In other words, is the game worth the candle?
The majority argues that it is not, because of the existence of "blocking and filtering software." The majority refers to the presence of that software as a "less restrictive alternative." . . . Conceptually speaking, the presence of filtering software is not an alternative legislative approach to the problem of protecting children from exposure to commercial pornography. Rather, it is part of the status quo, i.e., the backdrop against which Congress enacted the present statute. It is always true, by definition, that the status quo is less restrictive than a new regulatory law. It is always less restrictive to do nothing than to do something. But "doing nothing" does not address the problem Congress sought to address--namely that, despite the availability of filtering software, children were still being exposed to harmful material on the Internet.
Thus, the relevant constitutional question is not the question the Court asks: Would it be less restrictive to do nothing? Of course it would be. Rather, the relevant question posits a comparison of (a) a status quo that includes filtering software with (b) a change in that status quo that adds to it an age-verification screen requirement. Given the existence of filtering software, does the problem Congress identified remain significant? Does the Act help to address it? These are questions about the relation of the Act to the compelling interest. Does the Act, compared to the status quo, significantly advance the ball?
The answers to these intermediate questions are clear: Filtering software, as presently available, does not solve the "child protection" problem. It suffers from four serious inadequacies that prompted Congress to pass legislation instead of relying on its voluntary use. First, its filtering is faulty, allowing some pornographic material to pass through without hindrance. . . .
Second, filtering software costs money. Not every family has the $40 or so necessary to install it.
Third, filtering software depends upon parents willing to decide where their children will surf the Web and able to enforce that decision. As to millions of American families, that is not a reasonable possibility. More than 28 million school age children have both parents or their sole parent in the work force, at least 5 million children are left alone at home without supervision each week, and many of those children will spend afternoons and evenings with friends who may well have access to computers and more lenient parents.
Fourth, software blocking lacks precision, with the result that those who wish to use it to screen out pornography find that it blocks a great deal of material that is valuable. . . .
In sum, a "filtering software status quo" means filtering that underblocks, imposes a cost upon each family that uses it, fails to screen outside the home, and lacks precision. Thus, Congress could reasonably conclude that a system that relies entirely upon the use of such software is not an effective system. And a law that adds to that system an age-verification screen requirement significantly increases the system's efficacy. That is to say, at a modest additional cost to those adults who wish to obtain access to a screened program, that law will bring about better, more precise blocking, both inside and outside the home.
The Court's response--that 40% of all pornographic material may be of foreign origin--is beside the point. Even assuming (I believe unrealistically) that all foreign originators will refuse to use screening, the Act would make a difference in respect to 60% of the Internet's commercial pornography. I cannot call that difference insignificant.
My conclusion is that the Act, as properly interpreted, risks imposition of minor burdens on some protected material-- burdens that adults wishing to view the material may overcome at modest cost. At the same time, it significantly helps to achieve a compelling congressional goal, protecting children from exposure to commercial pornography. There is no serious, practically available "less restrictive" way similarly to further this compelling interest. Hence the Act is constitutional. . . .