The main issue is that it's very rare for someone to "own" a song. The publishing, label, composition, mechanical and performance rights might all belong to dif

The main issue is that it's very rare for someone to "own" a song. The publishing, label, composition, mechanical and performance rights might all belong to different entities in different territories and sometimes even in different windows. Relicensing is pretty common for films, but less common for TV, because there's less margin. And collective licensing for broadcast happens in lots of territories and not for on-demand or internet distribution.