I still have a vinyl of my mother's by the Clancy Bros & Tommy Makem recorded in a Chicago nightclub, The Gate Of Horn, called "Hearty & Hellish". I still think it's an excellent album. In fact I recently digitised it, though it's in terrible condition.

They've put the lyrics of that song alone on the back of the sleeve, presumably because by the end it's being sung so fast that people might have difficulty in distinguishing them. Except for the missing couplet, they agree with the final version posted above. The differences are:

+ Quotes around encore, which makes sense as it's something shouted.

- "It struck by Mickey Finn", but the above makes more sense.

I also have the songbook, and can confirm Trevor Hanson's statement above.

As for copyright, it was fashionable at the time to copyright everything possible, but I agree with Trevor, at least, unlike Dylan, the Clancies & TM didn't try to claim copyright over the bits they didn't actually write themselves.