Those income streams can last a long time, another attraction for investors. “Dylan’s copyrights on his work before 1978 expire 95 years after publication,” says Dotan Oliar, a professor at the University of Virginia School of Law who focuses on intellectual property. So the earliest songs in Dylan’s catalog, from 1962 (“Blowin’ in the Wind,” for example), could produce income until 2057. Copyrights on songs written on or after Jan. 1, 1978, Oliar says, “will expire 70 years after his death.”