Definition of First sale rule
Under this doctrine, a copyright holder who conveys title to a particular copy of a copyrighted work relinquishes exclusive right to vend that particular copy; although holder’s other rights remain intact, vendee holds right to distribute the transferred copy in whatever manner vendee chooses. U.S. v. Powell, C.A. Minn., 701 F.2d 70, 72.
That's the definition of First sale rule in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.