I'd always heard that the old variety shows can only be rerun and released on DVD as half-hour or "best of" shows because of music rights. But recently, I've seen episodes of THE CAROL BURNETT SHOW being rerun in their original 1-hour length. How can they do that?

Rerun where and are the music acts included

Rerun where and are the music acts included

DECASES shows them on weeknights and yes the music acts are included

They are probably airing the shows already released on dvd