which may be freely used by everyone. The reasons that the work is not protected include:
(1) the term of copyright for the work has expired; (2) the author failed to satisfy statutory
formalities to perfect the copyright or (3) the work is a work of the U.S. Government.
1 The term of joint works is measured by the life of the longest-lived author.
2 Works for hire, anonymous and pseudonymous works also have this term. 17 U.S.C. § 302(c).
3 Under the 1909 Copyright Act, works published without notice went into the public domain upon publication. Works published without notice between 1-1-78 and 3-1-89 (the effective date of the Berne Convention Implementation Act) retained copyright protection only if an effort to correct the accidental omission of notice was made within five years, such as by placing notice on unsold copies. 17 U.S.C. § 405.
“When U.S. Works Pass Into the Public Domain” chart courtesy of Laura Gasaway, Paul B. Eaton Distinguished Professor of Law Emeritus at the University of North Carolina School of Law.