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While copyrights and trademarks both protect intellectual property, they protect different types of intellectual property. Copyrights protect books, music, movies, and other works of art. Trademarks protect brand identity for a business. The best example is the logo.
For example, a trademark protects this: http://tinyurl.com/gmnca2m
On the other hand, if somebody pirates a movie online, then that is a copyright violation.
It is important to note that copyrights expire, while trademarks last forever. Accordingly, 100 years from now people will be able to freely copy Harper Lee's latest novel (the sequel to To Kill a Mockingbird), but nobody will be able to use the Starbucks logo except Starbucks. To that extent, a trademark offers more protection than a copyright.
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