@jesscat: I am going to make one more attempt to explain what I'm saying.
1) My position has nothing to do with "gaining protection" or keeping the right to sue people.
2) CC and, presumably, you claim that copyright applies even without the presence of that checkbox. I certainly hope it does, given that calibre is distributed in many forms not all of which are amenable to presenting a copyright notice. But, whether it does or does not, is irrelevant.
3) The GPL imposes restriction on what you as the end user can do. Even if those restrictions apply automatically, I still think it is polite to inform you of them. I know of no more effective way to do so than to present the license and to indicate that it has non trivial content, by adding a checkbox asking you to accept it. Which is what I have said repeatedly in this thread and been ignored.
I have only so much tolerance for people that push their agendas on others without taking the time to listen and appreciate that those others might have alternative views.
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