LOS ANGELES—In a stunning reversal of decades of copyright claims, a federal judge in Los Angeles has ruled that Warner/Chappell Music does not hold a valid copyright claim to the song “Happy Birthday To You,” commonly known simply as “Happy Birthday.”

Warner had been enforcing its copyright claim since it paid $15 million to buy Birch Tree Group, the successor to Clayton F. Summy Co., which owned the original copyright. Royalties on the song bring in about $2 million a year for Warner, according to some estimates.

Judge George H. King ruled Tuesday afternoon that a copyright filed by the Summy Co. in 1935 granted only the rights to specific arrangements of the music, not the actual song itself.

“Because Summy Co. never acquired the rights to the Happy Birthday lyrics,” wrote Judge George H. King, “Defendants, as Summy Co.’s purported successors-in-interest, do not own a valid copyright in the Happy Birthday lyrics.”

“ ‘Happy Birthday’ is finally free after 80 years,” said Randall Newman, an attorney for the plaintiffs, which included a group of filmmakers who are producing a documentary about the song. “Finally, the charade is over. It’s unbelievable.”

Up until now, Warner could charge anyone who wanted to sing or play “Happy Birthday to You” — with the lyrics — as part of a profit-making enterprise. Most often, this occurred with stage productions, on television, in movies or in greeting cards. But even those who wanted to sing the song publicly as part of a business, say a restaurant owner giving out free birthday cake to patrons, would technically have to pay to use the song.

The complex saga of this six-note ditty has spanned more than 120 years, withstanding two world wars and several eras of copyright law. The song has seen the rise and fall of vinyl records, cassette tapes, CDs and now, the era of digital streaming music.

The story begins in 1893, with a Kentucky schoolteacher and her older sister. Patty Smith Hill and Mildred J. Hill wrote the song for Patty’s kindergarten students, titling it “Good Morning to All.” The original lyrics Patty wrote were: “Good morning to you / Good morning to you / Good morning, dear children / Good morning to all.”

Patty later said that she had worked with her sister to compose a simple melody to match the words that could be easily sung by young children.

The sisters published the song in a book called Song Stories for the Kindergarten, and assigned the copyright to their publisher, Clayton F. Summy Co., in exchange for a cut of the sales.

That was only the beginning of the tangled web of copyright law that various attorneys have argued may or may not apply to the world’s most famous birthday song.

At various turns in the case, attorneys argued over whether or not the Hill sisters had actually written the song, whether they had “abandoned” their rights to what became the “Happy Birthday” tune and even whether Patty Smith Hill had been accurately quoted in a 1935 TIME magazine article.

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Tuesday’s ruling means that the song is now considered a public work and is free for everyone to use without fear of having to pay royalties, according to a statement from the plaintiffs’ attorneys.

Jennifer Nelson, a filmmaker and owner of Good Morning to You productions, called the decision a “great victory for musicians, artists and people around the world who have waited decades for this.”

The plaintiff’s attorneys have said that they will move next to qualify the lawsuit as a class-action, in an effort to recoup millions of dollars in royalties that Warner/Chappell has collected on the tune over the years.