Who's going to "enforce" this? The UN? (HAH)

The only way to force this issue is to "pirate before you buy-it" and save your money. Hard to get screwed by fake purchase buttons if you dont buy, and hit libgen, torrents, and usenet.

of course not the UN, but things that are sold are presumably sold, so... the country you bought it in?

but I agree, do not buy shit you dont own