First Sale Under Siege -- If You Bought It, You Should Own It
The "first sale" doctrine expresses one of the most important limitations on the reach of copyright law. The idea is simple: once you've acquired a lawfully-made CD or book or DVD, you can lend, sell, or give it away without having to get permission from the copyright owner. But the copyright industries have never liked first sale, since it creates competition for their titles (you could borrow the book from a friend, pick it up at a library, or buy it from a used book seller on Amazon). Two legal cases now pending could determine the future of the doctrine.
https://www.eff.org/...it-you-should-own-it