vivaoporto writes: NPR reports that "Happy Birthday to You", one of the most recognized songs in the English language, is the subject of a class action complaint over the validity of its copyright. The publisher Warner/Chappell Music owns the copyright to the "Happy Birthday" song and anyone who wants to use the song must pay a licensing fee. How did Warner/Chappell get the rights? "This is where it gets complicated," says Jennifer Nelson. She is working on a documentary about the song and paid for the rights to use it. Now she's suing Warner/Chappell to get her money back, arguing it's part of the public domain. "I think it's going to set a precedent for this song and other songs that may be claimed to be under copyright, which aren't," says Newman. The Courthouse News Service have more information about the pending suit.