A friend of mine works at a medical facility where the supplies are kept in a locked cabinet to which several people have keys.
My parents used to leave a gate key under a turtle shell on their porch, so their yard-maintenance contractor could access the backyard.
These are just a couple of the scenarios in which padlocks are commonly used, but every conventional padlock suffers from the same shortcomings: Access is granted to whomever holds the key or the combination, and it’s almost impossible to know who’s gained access and when. And if you lose the key or forget the combination, the lock becomes worse than useless; in fact, you might have to physically cut it off to gain access to whatever it was protecting. What’s that? You don’t carry bolt-cutters with you?
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