Rob Davies wrote:

Return DVD and inform store of such an issue, although these days it does not make much difference as most DVD players are not so restricted. But they may have a region 4 copy of your disc, and yes technically the shop is breaching some sort of copyright or something similar.

While they might be breaching an agreement with their suppliers, I really don't see how they'd be doing anything legally wrong. Not that I'm a lawyer or anything. DVD regioning is a technical measure to create artificial market segmentation. It's a business tool, and I'd be amazed if there's anything illegal about selling "out of region" DVDs.

The scheme is enforced by contracts and licenses with DVD player makers ("To get a CSS decoding key, you must also suppport regioning to our specifications") and vendors ("if you want us to sell you our stock, you can't sell any out-of-region DVDs from any other supplier"). In some countries it's backed up by piggy-backing on legislation that protects "technical anti-copying measures" by relying on the fact that CSS is both a copy protection technology AND a market segmentation device.

Sneaky, aren't they?

The upshot of this is that, AFAIK, it's quite legal to buy and sell out-of-region discs, supplier agreements permitting. You can also play them if you can find a player that'll do it, and if the local laws don't consider the player a copyright circumvention device (which they most likely won't - the player isn't what does the copying). Your challenge isn't legal, but rather getting around the rather neat locked in agreements the studios and the DVD CCA have with equipment vendors and disc retailers. All I can say there is "Thank-you, China!".

--
Craig Ringer