Cite as: 537 U. S. 186 (2003)
Stevens, J., dissenting
use that would invalidate the patent, even if it might have had that effect prior to the amendment of the patent statute in 1836. 1 How., at 206-208. The Court then disposed of the case on the ground that a statute enacted in 1839 protected the alleged infringer's right to continue to use the process after the patent issued. Id., at 209-211. Our opinion said nothing about the power of Congress to extend the life of an issued patent. It did note that Congress has plenary power to legislate on the subject of patents provided "that they do not take away the rights of property in existing patents." Id., at 206. The fact that Congress cannot change the bargain between the public and the patentee in a way that disadvantages the patentee is, of course, fully consistent with the view that it cannot enlarge the patent monopoly to the detriment of the public after a patent has issued.
The history of retroactive extensions of existing and expired copyrights and patents, though relevant, is not conclusive of the constitutionality of the Sonny Bono Act. The fact that the Court has not previously passed upon the constitutionality of retroactive copyright extensions does not insulate the present extension from constitutional challenge.
V
Respondent also argues that the Act promotes the useful arts by providing incentives to restore old movies. For at least three reasons, the interest in preserving perishable copies of old copyrighted films does not justify a wholesale extension of existing copyrights. First, such restoration and preservation will not even arguably promote any new works by authors or inventors. And, of course, any original expression in the restoration and preservation of movies will receive new copyright protection.13 Second, however strong
13 Indeed, the Lodging of the Motion Picture Association of America, Inc., as Amicus Curiae illustrates the significant creative work involved in releasing these classics. The Casablanca Digital Video Disc (DVD) con-
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