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One of the biggest dangers with software is that vulnerabilities, once discovered, can be exploited remotely or by persons without the necessary knowledge and talent to actually build the exploit themselves.

Nearly all locks can be picked. However, unless you are the target of a major criminal organization or government agency, it is reasonable to expect that your lock will not have to withstand someone who has invested thousands of hours into learning how to pick the most sophisticated locks. With a network-connected device, it only takes one clever fellow to discover the vulnerability and all of a sudden script kiddies everywhere can be deploying it against your lock.