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Opinion of the Court
petitioners ask us to apply the "congruence and proportionality" standard described in cases evaluating exercises of Congress' power under § 5 of the Fourteenth Amendment. See, e. g., City of Boerne v. Flores, 521 U. S. 507 (1997). But we have never applied that standard outside the § 5 context; it does not hold sway for judicial review of legislation enacted, as copyright laws are, pursuant to Article I authorization.
Section 5 authorizes Congress to enforce commands contained in and incorporated into the Fourteenth Amendment. Amdt. 14, § 5 ("The Congress shall have power to enforce, by appropriate legislation, the provisions of this article." (emphasis added)). The Copyright Clause, in contrast, empowers Congress to define the scope of the substantive right. See Sony, 464 U. S., at 429. Judicial deference to such congressional definition is "but a corollary to the grant to Congress of any Article I power." Graham, 383 U. S., at 6. It would be no more appropriate for us to subject the CTEA to "congruence and proportionality" review under the Copyright Clause than it would be for us to hold the Act unconstitutional per se.
For the several reasons stated, we find no Copyright Clause impediment to the CTEA's extension of existing copyrights.
III
Petitioners separately argue that the CTEA is a content-neutral regulation of speech that fails heightened judicial review under the First Amendment.23 We reject petitioners'
23 Petitioners originally framed this argument as implicating the CTEA's extension of both existing and future copyrights. See Pet. for Cert. i. Now, however, they train on the CTEA's extension of existing copyrights and urge against consideration of the CTEA's First Amendment validity as applied to future copyrights. See Brief for Petitioners 39-48; Reply Brief 16-17; Tr. of Oral Arg. 11-13. We therefore consider petitioners' argument as so limited. We note, however, that petitioners do not explain how their First Amendment argument is moored to the prospective/ retrospective line they urge us to draw, nor do they say whether or how their
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