The thing that's just so frustrating about this is that this is our culture. Jazz (and its precursors) formed the foundations of pop, of rock, of rap. It's easy to think of culture as abstract concepts like our "freedom" or "ambition", but in the last century we've broadened our culture to be, in part, rooted in commercial entities. It's not bad, it's not good, it just is. The unfortunate effect though, as demonstrated by this find, is that we've permitted that part of our heritage to be legally locked away from us.