Tucked into the U.S. Supreme Court’s agenda this fall is a little-known case that could upend your ability to resell everything from your grandmother’s antique furniture to your iPhone 4.

At issue in Kirtsaeng v. John Wiley & Sons is the first-sale doctrine in copyright law, which allows you to buy and then sell things like electronics, books, artwork and furniture, as well as CDs and DVDs, without getting permission from the copyright holder of those products.

Under the doctrine, which the Supreme Court has recognized since 1908, you can resell your stuff without worry because the copyright holder only had control over the first sale.

Put simply, though Apple Inc. AAPL -2.13% has the copyright on the iPhone and Mark Owen has it on the book “No Easy Day,” you can still sell your copies to whomever you please whenever you want without retribution.