194
Opinion of the Court
under the heightened judicial scrutiny appropriate for such regulations.
In accord with the District Court and the Court of Appeals, we reject petitioners' challenges to the CTEA. In that 1998 legislation, as in all previous copyright term extensions, Congress placed existing and future copyrights in parity. In prescribing that alignment, we hold, Congress acted within its authority and did not transgress constitutional limitations.
I
A
We evaluate petitioners' challenge to the constitutionality of the CTEA against the backdrop of Congress' previous exercises of its authority under the Copyright Clause. The Nation's first copyright statute, enacted in 1790, provided a federal copyright term of 14 years from the date of publication, renewable for an additional 14 years if the author survived the first term. Act of May 31, 1790, ch. 15, § 1, 1 Stat. 124 (1790 Act). The 1790 Act's renewable 14-year term applied to existing works (i. e., works already published and works created but not yet published) and future works alike. Ibid. Congress expanded the federal copyright term to 42 years in 1831 (28 years from publication, renewable for an additional 14 years), and to 56 years in 1909 (28 years from publication, renewable for an additional 28 years). Act of Feb. 3, 1831, ch. 16, §§ 1, 16, 4 Stat. 436, 439 (1831 Act); Act of Mar. 4, 1909, ch. 320, §§ 23-24, 35 Stat. 1080-1081 (1909 Act). Both times, Congress applied the new copyright term to existing and future works, 1831 Act §§ 1, 16; 1909 Act §§ 23-24; to qualify for the 1831 extension, an existing work had to be in its initial copyright term at the time the Act became effective, 1831 Act §§ 1, 16.
In 1976, Congress altered the method for computing federal copyright terms. 1976 Act §§ 302-304. For works cre-
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