Nerd, how about this:

Behan: My name is O'Hanlon, my age is sixteen
Dylan: Oh my name it is nothin', my age it means less

Behan: My home is in Monaghan, 'twas there I was weaned
Dylan: The country I come from, is called the midwest

Behan: I was taught all my live cruel England to blame
Dylan: I was taught and brought up there, the laws to abide

Behan: That made me a part of the Patriot game
Dylan: And the land that I live in, has God on its side
(the last phrase of each song is repeated at the end of each verse, i.e. similar pattern)

I have always thought there was not enough for a legal action of any kind but even Dylan's mother would agree that he was influenced by Behan's first verse and although the tune is trad, he obviously got it from the Patriot game.