On July 8, 1870, the second general revision of U.S. copyright law centralized copyright activities, including registration and deposit, in the Library of Congress. It also extended protection to works of art, gave authors the right to create their own derivative works, including translations and dramatizations, and began the indexing of registration records. From the History of Copyright Timeline at the U.S. Copyright Office.

By Diliff (Own work) [CC BY-SA 2.5 (http://creativecommons.org/licenses/by-sa/2.5)], via Wikimedia Commons.