Thanks for your response. For code protection I was thinking of locking out JTAG (lock without password) and then using BSL to mass erase in case I need to reprogram (which also resets the JTAG lock). Of course I can set the JTAG password instead of locking it out - but JTAG does not seem to have the BSL security feature of automatically erasing the memory in case of invalid password attempt. This seems to be a good deterrent against brute force attack.
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