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Turns out, my question about whether Alfonso Ribeiro's dance was sufficiently original to qualify for protection was answered today: No.
It's the U.S. Copyright Office's determination and subject to challenge in court, but it seems right to me.
https://www.hollywoodreporter.com/t...e-star-alfonso-ribeiros-carlton-dance-1186666
Ribeiro was never going to win because The Carlton is not original and it already had been portrayed in film years before the Prince of Bel Air aired an episode. His character is simply doing the "white people's dance" of the 80's, like Molly Ringwall in The Breakfast Club (1985), or music videos like 1982's Mad World by Tears For Fears.
Now, the question I have, would the intellectual owners of The Fresh Prince of Bel Air have a case? The dance plus the name "fresh" makes it obvious where they got the idea from.