I found some of the clues rather tendentious, eventually managed the message, and then followed up the link in the last six words to uncover another very obscure Celt who did not seem to offer anything in the way of elucidation. Then, quite by accident, I Googled the first part of the message and that took me immediately to the three names.
Still not sure, however, what the last six words refer to, apart from greater Enlightenment on the other side of The Pond.
Nowadays all this legal fuss seems absurd, particularly in view of the fact that the work in question is surely a strong contender for the greatest 20C example of its genre.