SEOUL—South Korea’s Supreme Court rejected a 30 million won ($21,600) damage claim on Thursday by an American composer who accused a South Korean kids content company of plagiarizing his version of “ Baby Shark,

A copyright battle over the viral song “Baby Shark,” adored by young children and often dreaded by their parents, has come to an end with a court clearing the Korean creators of the most popular version of plagiarism.

South Korea's Supreme Court has rejected a US composer's allegation that the producers of the inescapably catchy children's song Baby Shark plagiarised his work, ending a six-year-long legal battle.