This document summarizes key aspects of copyright law as it relates to libraries. It defines intellectual property and the four types: patents, trademarks, trade secrets, and copyright. It examines US copyright law, including the Copyright Acts of 1790, 1909, and 1976. It discusses relevant sections for libraries, such as fair use (Section 107) and library exceptions (Section 108). It also covers issues like orphan works, works whose copyright owners can't be identified, and the shrinking public domain due to copyright term extensions. The conclusion is that librarians must stay up-to-date on copyright laws to avoid violations when providing resources to patrons.