Originally Posted by Fluribus
My experience with DRM is that it doesn't prevent piracy. It does, however, put burdens on the paying customer.
Locking the door of physical bookstores also puts a burden on the paying customer. If everyone was like me, they could trust that the money would be put near the register when I, on rare occasion, took a book during unstaffed hours. But because they don't trust the public, they have to lock doors, put in alarms, spy on customers with mirrors, threaten to jail shoplifters, and so forth. There may be an ultra-low-crime area on this planet where a bookstores does, quietly and without publicity, welcome customers when unstaffed. But, generally, it would reduce revenue.
As far as I can see, a lock on the door is no more or less a sign of distrusting readers than is DRM.