A lawsuit has been filed against Warner/Chappell claiming that the company has wrongfully asserted copyright ownership of Happy Birthday To You.

The claim is made by TV production company Good Morning To You Productions, which says that Warner/Chappell’s copyright over the world’s most popular song is invalid.

GMTY is seeking a declaration that Happy Birthday is dedicated to public use and is in the public domain.

The lawsuit came about when the production company was making a documentary about the ...