Jazz, of course, is open source all the way — it’s the ultimate freedom machine. Once you’ve grasped the melody line and basic chord structure of any song, you’re on your own, encouraged to take the author’s initial inspiration anywhere you wish. A jazz musician isn’t judged by the faithfulness of his rendition but by what he codes at the musical keys.
Even the legal underpinnings of jazz are different, at least in the trenches. No one who is really serious about jazz goes out and buys, say, an Oscar Peterson, Miles Davis or Mahavishnu John McLaughlin song book, setting down note for note what the great musician played. How could you? They played it different every time.