You have to unlock most modules, or input a code along with updates, otherwise you brick the the module.

Current generation vehicle electrical architectures are not network safe and rely on physical security.

There is a big trade-off here for the next generation; the electrical architecture will be COMPLETELY locked down, and end users will be locked out of making any updates to modules - something that tinkerers and home-brewers are at odds with. Read only access will still be allowed.

This device works on the CAN bus, where you can actually issue commands, not just listen. So this is a bad idea in that sense.