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Snippet from Wikipedia: Fair use

Fair use is a doctrine in the law of the United States that permits limited use of copyrighted material without having to first acquire permission from the copyright holder. Fair use is one of the limitations to copyright intended to balance the interests of copyright holders with the public interest in the wider distribution and use of creative works by allowing as a defense to copyright infringement claims certain limited uses that might otherwise be considered infringement. Like "fair dealing" rights that exist in most countries with a British legal history, the fair use right is a general exception that applies to all different kinds of uses with all types of works and turns on a flexible proportionality test that examines the purpose of the use, the amount used, and the impact on the market of the original work. The innovation of the fair use right in US law is that it applies to a list of purposes that is preceded by the opening clause "such as." This has allowed courts to apply it to technologies never envisioned in the original statute including Internet search, the VCR, and the reverse engineering of software.

Creative Commons Attribution-Share Alike 3.0

Fair Use Source: http://www.cloudmonk.io/glossary/fair-use