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A patent troll is "somebody who tries to make a lot of money off a patent that they are not practicing and have no intention of practicing and in most cases never practiced." The topic of patent trolls has boosted up some important discussion in the recent year. Trolls tend to target internet retailers, service, information and news providers who are the end users of the patented technology. In May, 2006, the U.S. Supreme Court said in its unanimous verdict in eBay Inc., et al. v. MercExchange, No. 05-130. There is no such rule, patent owners do not have an automatic right to an injunction that could cripple the business of an infringer. The proper approach to the question of whether to award a permanent injunction is to apply a four-point test. In Korea, controlling patent abuse is also an emerging issue. To regulate patent abuse in patent trolling, we can rely on the principle of faith or Trust Act Article 7. Just acquisition of patent for litigation would not be allowed. Also, PIT(Patent Investment Trust) PUBPAT(Public Patent Foundation) would be helpful to solve these patent troll problem