Just a little side note: In old times amongst wargame designers it was considered a sign of respect, if one designer mentioned the works of another designer as an inspiration to his own work. Perhaps copyright was more/less feared/enforced, but certainly those guys held up one aspect, that is lost nowadays: Give respect to those who went before you on that road. Certainly you can't invent the wheel anew each time, and the definition (= written rule) what a ZOC is and its effects are, can´t be rewritten every time anew in such a way, that it doesn´t look similar to the 1564 times that rule was written and published before. Perhaps wargaming is very different in many aspects, but one thing remains constant in that niche aspect of gaming: Nobody simply goes ahead to rewrite this rule and just puts his own copyright stamp on that and then starts arguing, that he is doing okay, since some obscure law decisions may be saying, that he is doing (perhaps) the right thing.
And since I make a bet, that Fyrlock is reading all of this: You may be right or wrong in your argumentation considering copyright aspects in this case. This is not for me to decide, there are better educated/versed people on this subject to do so. Certainly you have more insight into the subject of copyright, IP, PI or whatever part of legal subjects this whole affair is based on than I do, but from one of those guys who were raised on the normal foundations of civilized human conduct:
Personally spokne for me it´s bad behavour from your side in this case.
You may win at court, but what if you lose? Or are you gambling on an agreement outside of the court?
And a question I raised before, I state again: What is your personal reason to "go to war" on this subject?
(Yes personal opinion and rant on that, sorry).