Intellectual property rights refer to "the exclusive rights enjoyed by rights holders over the results of their intellectual work" and are generally only valid for a limited period of time. Various intellectual creations such as inventions, literary and artistic works, as well as logos, names, images and designs used in commerce can be considered intellectual property rights owned by a person or organization. According to Professor Mark Lemley of Stanford Law School, widespread use of the term "intellectual property" emerged after the founding of the World Intellectual Property Organization in 1967 and has only become common in recent years. Trademarks are also designed and are a type of intellectual property rights. They are part of intellectual property rights, trademark categories, intellectual property rights