If your business is involved in selling, recycling or loaning used goods, the U.S. Supreme Court affirmed the owner's rights to resell such items. In other words, if you bought it, you own it and you can sell it.
The case held that those who lawfully buy copyrighted works or items own them and have the right to resell them without going back to get approval of the original copyright holder. After the first sale, the copyright holder no longer has rights in the item. It's called the "first sale" doctrine.
The case, Wiley vs. Kirtsaeng, was decided in March 2013 and applied to goods manufactured outside the U.S. but subject to U.S. copyright law.
Syllabus (summary) only. The full Supreme Court decision is at: http://1.usa.gov/149xKz0.