DVDs and other media like e-books frequently have “region locks” which arbitrarily prevents consumers from using their products in specific locations. There is no legitimate security reason for this, it is simply a greedy move to limit the resale market and force customers to buy more things.
Imagine if BMW told you that your car wasn’t allowed to be driven anywhere except North America. Want to move to Europe? Sorry, you’ll have to buy a new car, or a new DVD, or a new e-book.
De Beers made it socially unacceptable to resell diamonds so people would buy new ones, but modern tech companies are making it physically impossible to resell the electronic or digital goods consumers supposedly own.