Nigel, we do need a permathread on this. I remember at least three other thrreads I have looked at in the past year. I would suggest that someone with legal knowledge of copyright laws (university law prof?) should be found to volunteer aid in the editing.

Most of us are commenting to the best of our ability, but in my case the interpretations come mostly from talks with my son the lawyer, whose firm practices criminal and contract law; he does not claim to be knowledgeable on copyright litigation.