Public domain is not one blanket badge — each source can carry its own caveat
Documented covers, adaptations, and cultural echoes — each with a real, dated source
A false, decades-long ownership claim on one of the most universally performed songs in existence went almost entirely unchallenged — the kind of thing this whole site exists to catch — until one documentary filmmaker’s persistence unwound it.
In 2013, Jennifer Nelson — who was making a documentary about the song’s own history and had been asked to pay a licensing fee to use it — filed the class-action that ultimately invalidated the copyright.
Warner/Chappell reportedly collected roughly $2 million a year, enforcing its claim primarily against films and TV while largely leaving private, informal singing alone.
Every source cited on this page — 7 in total