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A version of this article originally appeared on Hypebot.
In a stunning reversal, a federal judge ruled that all copyright claims against "Happy Birthday" are invalid and declared that the song is in the public domain and free to use. It's a huge loss for Warner Chappell Music, which bought the rights in 1988, but it's a big win for enterprising musicians.
Now that "Happy Birthday" is in the public domain, anyone can record and release their own version of the track and keep 100 percent of the royalties. Here are four ways you can make money from the song.