Then he probably shouldn't have released his content with the following license: "This work is not copyrighted. Do whatever you want with it, absolutely no re

Then he probably shouldn't have released his content with the following license: "This work is not copyrighted. Do whatever you want with it, absolutely no restrictions, and no permission necessary." If you care about your fame, don't pick a license that literally states you are happy for people to do whatever they want. I have no sympathy for somebody who writes a license himself (what's wrong with MIT), reassures people that they're allowed to base their livelihood off his work, then changes his mind once they start making more money than him. He's of course welcome to have whatever restrictions he wants on his work. But don't claim to have some moral high ground when you're litigating against people who trusted you to be honest. At best he's doing it to satisfy his ego, at worst for money.