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Should "Happy Birthday" Protected by Copyright?
Understanding Public Domain
What works have expired into the public domain?
- All works published in the U.S. before 1923
- All works published with a copyright notice from 1923 through 1963 without copyright renewal
- All works published without a copyright notice from 1923 through 1977
- All works published without a copyright notice from 1978 through March 1, 1989, and without subsequent registration within 5 years