I have one sudgestion!. Developer license should come with another file that will be put on production server. Main one will only be used on developer computer. And when you compile .dll then something is integrated in that .dll and only with use of that other file that I mention first you can execute code ok. If somone copy that file he could not use to compile .dll with CuteEditor because its only for running!
I don't know did I make myself clear. This is only my idea and I'm not sure if its possible but to me it sound good.