Sell Old Electronics
The Supreme Court case concerns something called the "first-sale doctrine" in copyright law. Simply put, the doctrine means that you can buy and sell the stuff you purchase. Even if someone has copyright over some piece of your stuff, you can sell it without permission from the copyright holder because the copyright holder can only control the "first-sale." The Supreme Court has recognized this doctrine since 1908.
To use a classic example, imagine you buy a novel by Sabina Murray. Sabina owns the copyright to the book, so you can't make a copy of the book. But you bought a copy of the book, and can sell the copy to anyone who'll pay you for it. You can sell it to a neighbor, to a fellow student, or to someone else on Craigslist or on eBay.