It's good to know that people who sing this song aren't going to be sued for breach of copyright.

HOWEVER this thread gives me a chance for another whinge. I feel very uncomfortable when an English person sings it in an English folk club and nearly everyone joins in lustily on the chorus. Do they think the American Revolution was an anomaly that will eventually be rectified, so the land concerned is really theirs? Or is this just another instance of people singing without paying any attention to the words?