Us copyright law how many years

In the case of "a joint work" (prepared by two or more authors) the term lasts for 70 years after the last surviving author's death.
For works made for hire, and for anonymous and pseudonymous works, copyright protection generally lasts for 95 years from publication or 120 years from creation, whichever is shorter.

The term of copyright for a particular work depends on several factors.
Copyright protection may be affected if the copyright has been published, and, if so, the date of first publication.
Generally, for works created after January 1, 1978, copyright protection lasts for the life of the author or copyright owner plus an additional 70 years.

The duration of copyright is literary or musical works or artistic works is for the life of the author and fifty years from the end of the year in which the author dies.
If before the death of the author the work has been: