Cite as: 537 U. S. 186 (2003)
Opinion of the Court
plea for imposition of uncommonly strict scrutiny on a copyright scheme that incorporates its own speech-protective purposes and safeguards. The Copyright Clause and First Amendment were adopted close in time. This proximity indicates that, in the Framers' view, copyright's limited monopolies are compatible with free speech principles. Indeed, copyright's purpose is to promote the creation and publication of free expression. As Harper & Row observed: "[T]he Framers intended copyright itself to be the engine of free expression. By establishing a marketable right to the use of one's expression, copyright supplies the economic incentive to create and disseminate ideas." 471 U. S., at 558.
In addition to spurring the creation and publication of new expression, copyright law contains built-in First Amendment accommodations. See id., at 560. First, it distinguishes between ideas and expression and makes only the latter eligible for copyright protection. Specifically, 17 U. S. C. § 102(b) provides: "In no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work." As we said in Harper & Row, this "idea/expression dichotomy strike[s] a definitional balance between the First Amendment and the Copyright Act by permitting free communication of facts while still protecting an author's expression." 471 U. S., at 556 (internal quotation marks omitted). Due to this distinction, every idea, theory, and fact in a copyrighted work becomes instantly available for public exploitation at the moment of publication. See Feist, 499 U. S., at 349-350.
Second, the "fair use" defense allows the public to use not only facts and ideas contained in a copyrighted work, but also expression itself in certain circumstances. Codified at 17 U. S. C. § 107, the defense provides: "[T]he fair use of a
free speech argument applies to copyright duration but not to other aspects of copyright protection, notably scope.
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