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To me the question really boils down to this-how many changes or how substantial a change is needed before the license to anything is a moot point legally.
There's probably a practical answer to that (I'll ignore the fact you put that last word "leegally" in as the legal answer would be expensive, would depend on the specific facts and may be different in different locations so I don't think that answer is going to land in this forum) - if you've changed enough to make the license a moot point then you shouldn't have bothered buying the plans in the first place because you're not using them (or at least that seems to be what your defence is).
You may also get into spare parts type territory. Have you ever noticed its perfectly OK for after market manufacturers to make a water pump that fits and looks like the one you just wore out on your Ford or Honda?
I would be interested in people opinion on a few ethics questions.1. If company B copies company A's design, do you feel it is unethical to purchase the copied items from company B?This one is a little more tricky2. Buggy builder B copied their frame design from buggy builder A. Supplier 2 makes a large buggy part very similar to one from supplier 1. Supplier 1 is vocal that it is a copy. Buggy builder A prefers supplier 2's product over supplier 1's original but is concerned about the ethics of dealing with supplier 2. An additional twist is that supplier 1 is aware of the frame design issue yet sells his product to buggy builder B. Should buggy builder A buy from supplier 2?