Cite as: 537 U. S. 186 (2003)
Opinion of the Court
holders in parity with future holders, the author of a work created in the last 170 years would reasonably comprehend, as the "this" offered her, a copyright not only for the time in place when protection is gained, but also for any renewal or extension legislated during that time.21 Congress could rationally seek to "promote . . . Progress" by including in every copyright statute an express guarantee that authors would receive the benefit of any later legislative extension of the copyright term. Nothing in the Copyright Clause bars Congress from creating the same incentive by adopting the same position as a matter of unbroken practice. See Brief for Respondent 31-32.
Neither Sears, Roebuck & Co. v. Stiffel Co., 376 U. S. 225 (1964), nor Bonito Boats, Inc. v. Thunder Craft Boats, Inc., 489 U. S. 141 (1989), is to the contrary. In both cases, we invalidated the application of certain state laws as inconsistent with the federal patent regime. Sears, 376 U. S., at 231- 233; Bonito, 489 U. S., at 152. Describing Congress' constitutional authority to confer patents, Bonito Boats noted: "The Patent Clause itself reflects a balance between the need to encourage innovation and the avoidance of monopolies which stifle competition without any concomitant advance in the 'Progress of Science and useful Arts.' " Id., at 146.
21 Standard copyright assignment agreements reflect this expectation. See, e. g., A. Kohn & B. Kohn, Music Licensing 471 (3d ed. 1992-2002) (short form copyright assignment for musical composition, under which assignor conveys all rights to the work, "including the copyrights and proprietary rights therein and in any and all versions of said musical composition(s), and any renewals and extensions thereof (whether presently available or subsequently available as a result of intervening legislation)" (emphasis added)); 5 M. Nimmer & D. Nimmer, Copyright § 21.11[B], p. 21-305 (2002) (short form copyright assignment under which assignor conveys all assets relating to the work, "including without limitation, copyrights and renewals and/or extensions thereof"); 6 id., § 30.04[B][1], p. 30-325 (form composer-producer agreement under which composer "as-signs to Producer all rights (copyrights, rights under copyright and otherwise, whether now or hereafter known) and all renewals and extensions (as may now or hereafter exist)").
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