I don't know if they're used worldwide, the cases have a plastic bar inside that looks like it can only be opened by a couple of powerful magnets moving past in a specific way. A few times the place I've purchased the DVD from has forgotten to unlock them, and I've only realised once I got home.
This time, it was about TWO MONTHS later, I'd long ago thrown out the receipt... so I have to BREAK INTO the case; I can't take it back to unlock it since they'll just assume I lifted it.
Do these locks even stop shoplifting? You can still open the case with a fair bit of brute force, although I damaged mine a little.
It's a bit like that "downloading movies is stealing" header at the start of every DVD, that you CANNOT skip... 5% steal but the 95% that actually buy the product still have to suffer through this shit... same with locks.
rant over
