Tor Ebooks

So, when Tor does it's periodic 'Get your free ebooks, get your free ebooks here!-- Unless you don't live in North America,' thing, does Tor... actually check if your are from the USA or Canada, or is it an honour system?

("Why yes I am very North American-- er, snow! Yes snow is a thing! In january can you believe it! ... Maple syrup! So delicious! So definitely made where I live, haha.")