Hi Steve, First the "10x in advance" means thanks in advance. The main importance of protecting my code is to save headache of customers that want to be smart and change it and then complain on bugs and problems.
10x
I'd say that's more of a policy issue than a technical issue. You have a contract or agreement with your customers, right? Just place a cluase in it that addresses your concerns. You don't have to support people who have altered your code... nor should they expect to be supported.
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