People have always stolen/borrowed/been influenced by(delete as applicable). The Robin Hood justification is that you steal from the rich and give to the poor. The genius argument is that you vastly improve what you take. The Dylan argument...well, there isnt one, he just did it.And let's face it, he had the most amazingly winning smile, and really cute tousled hair. And that is how the world wags. Dave van Ronk will get a very small footnote in the history of the world( "supplier of famous chord sequence to Bob Dylan and the Animals"). Only very educated people know where Sjhakespeare got his stories from. And who knows who made Alexander the Great's sword?