Sorry Kendall, I do understand your position and I agree with you. Creative ownership is an important topic.

My point with Dylan is that the song was based in public domain to begin with. The circumstances between Clayton and Dylan may be a bit cloudy (read Anthony Scaduto's take on it)but from what I've seen, Dylan does seem to give credit to others where it is due. He credits the Clancy's for their influence on his career, as well as the well-documented "mentor" of Woody Guthrie. The folk process can be difficult.