Copyright is the exclusive legal right to reproduce, publish, sell or distribute a work. The first copyright statute was created in 1710 in Great Britain, and the first US copyright law was enacted in 1790. There are different types of copyright licenses like implied and express licenses. Fair use allows limited use of copyrighted works without permission for purposes like education or commentary if it meets four factors: the use's purpose, the work's nature, how much is used, and the effect on the work's market. Educators can use portions of copyrighted works for classroom teaching under certain conditions like the Teach Act. Penalties for copyright infringement can be up to $150,000 per act but ignorance is not a defense,