I have DMCA, record companies and movie studios that make me feel like a criminal despite having paid full price. I hate them with a passion. HATE THEM!
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.
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.