A single-author work: life of creator + 70 years
Joint work, more than 1 author, not work-for-hire: 70 years after the last surviving author’s death
Works made for hire (for an employer): 95 years from publication or 120 years from creation, whichever is shorter
Anonymous and pseudonymous works (unless the author’s identity is revealed in Copyright Office records): 95 years from publication or 120 years from creation, whichever is shorter
These rules refer to works created in the U.S. since 1978.
For more specific guidelines for works created before 1978 with or without the © symbol, see the Digital Copyright Slider.
Prior to the 1976 law (which took effect in 1978), works were copyrighted starting on the date they registered with the © icon for an initial period of 28 years, with the possibility of one 28-year renewal. The 1976 law extended the renewal period to 47 years, for a total term of 75 years of protection. The 1998 law (aka the Sonny Bono Act) extended the term another 20 years, for a total of 95 years (28+47+20).
(Copyright Basics, Copyright.gov [PDF])
The information presented here is for informational purposes only and should not be considered legal advice.