fair use

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun law : a doctrine in intellectual property law that permits one party to make use of another party's protected intellectual property (such as a copyright or trademark) under narrowly defined circumstances

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the conditions under which you can use material that is copyrighted by someone else without paying royalties