Since my business deals with contracts, I can add to this discussion that the covenant to build only one aircraft per set of plans purchased is enforceable only against the original purchaser. If he violates the terms of his purchase contract by selling the plans, that is a matter between him and his contracting partner (here, RR). Anyone who buys the plans from him is violating no laws, and is not even violating a contract, since the second purchaser has no contract with RR. Even language on the plans themselves-- "For one A/C only" or something like that--has no effect on the second purchaser.
As to the morality of buying used plans, that's a question for a priest, not a lawyer. I can only say that the second purchaser has violated no laws or contract. The above is for general reference only and is not meant to be legal advice. Max Hardberger
