Cite as: 532 U. S. 23 (2001)
Opinion of the Court
combination thereof . . . which is likely to cause confusion . . . as to the origin, sponsorship, or approval of his or her goods." 15 U. S. C. § 1125(a)(1)(A). Congress confirmed this statutory protection for trade dress by amending the Lanham Act to recognize the concept. Title 15 U. S. C. § 1125(a)(3) (1994 ed., Supp. V) provides: "In a civil action for trade dress infringement under this chapter for trade dress not registered on the principal register, the person who asserts trade dress protection has the burden of proving that the matter sought to be protected is not functional." This burden of proof gives force to the well-established rule that trade dress protection may not be claimed for product features that are functional. Qualitex, supra, at 164-165; Two Pesos, Inc. v. Taco Cabana, Inc., 505 U. S. 763, 775 (1992). And in Wal-Mart, supra, we were careful to caution against misuse or overextension of trade dress. We noted that "product design almost invariably serves purposes other than source identification." Id., at 213.
Trade dress protection must subsist with the recognition that in many instances there is no prohibition against copying goods and products. In general, unless an intellectual property right such as a patent or copyright protects an item, it will be subject to copying. As the Court has explained, copying is not always discouraged or disfavored by the laws which preserve our competitive economy. Bonito Boats, Inc. v. Thunder Craft Boats, Inc., 489 U. S. 141, 160 (1989). Allowing competitors to copy will have salutary effects in many instances. "Reverse engineering of chemical and mechanical articles in the public domain often leads to significant advances in technology." Ibid.
The principal question in this case is the effect of an expired patent on a claim of trade dress infringement. A prior patent, we conclude, has vital significance in resolving the trade dress claim. A utility patent is strong evidence that the features therein claimed are functional. If trade dress protection is sought for those features the strong evidence
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