Martin Carthy did not sue Paul Simon, the dispute was that Paul claimed copyright to the whole thing as his own. Martin thought there
he should have given the TRADITION some credit. If you look and listen closely to Martin Carthy songs you will sometimes find a song largely rewritten by Martin and the credits will always say 'traditional arranged Carthy '.
The last time Paul Simon was in England he telephoned Martin and asked him to play at his main concert in London, Martin accepted and they are once again good friends.
Dave