Edited to add : While the web pages talk pretty much about smart locks, both manufacturers offer purely mechanical locks (or hybrids), which cannot be copied easily.
Maybe it's that I've never rented a nice enough place, but all my past landlords have chosen the £10-a-lock non-patent-protected locks over the £100-a-lock high security locks.
My landlord in the US uses cheap locks, he said he throws them away after each lease and puts in new ones. It was lucky for me one day when I forgot my keys, but had my lockpicking kit in my backpack. It took about 5 minutes to rake both the knob and deadbolt and get in.
Those are very high end ones I'd expect to see on commercial installations or homes of the ultra rich. Most landlords in my part of the US use the cheap regular off-the-shelf locks, where you can copy the key for a couple of dollars at Home Depot and throw the lock out once the tenant departs.
Only the entity ordring the locks is authorized to have additional keys made. And it's pretty heavily enforced by the manufacturers and distibuters.
Copies are also more than 5 quid.
[1] https://www.dormakaba.com/hr-hr/proizvodi/proizvodi/mechanic...
[2] https://www.assaabloy.ch/en/local/switzerland/landingpage/as...
Edited to add : While the web pages talk pretty much about smart locks, both manufacturers offer purely mechanical locks (or hybrids), which cannot be copied easily.