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Anyway, your argument is again moot, because it doesn't matter if the phone is subsidized. You signed a contract to pay off the phone over the course of 2 years through the carrier. When you buy a car, financed, does the dealer say "We're not going to let you change the timing of the engine! You didn't pay us in full, so you can't do what you want to!"
No, they DO let you do what you want to, because that is your car. Not theirs. It's off their hands. Why should it be any different for mobile devices? Also, say you buy a locked phone off-contract, full price -- but it's still locked to AT&T, and you do use AT&T for one year, but then want to switch to T-Mobile. You've paid off the phone. AT&T agrees, and they don't charge you any early termination fees. Then, you want to unlock it to use it on T-Mobile, but wait! You can't, because the DMCA doesn't let you.
Don't you see how unjust this is?
However, in this case I can totally see Motorola's argument. Not sure in your case, but most people don't pay full price for their phones, they buy it subsidized. The reason you're locked on AT&T (in your example) is that you buy a highly subsidized device in exchange for staying with them for x years. That's precisely why I buy unlocked phones and never sign contracts. But if you signed a contract then you should honour that contract.