Microsoft is worried, ladies and gents. Worried that people in Europe and America are getting things that they just shouldn't have. A fully fledged and quite well-stocked media marketplace simply should not be in the hands of the Europeans! And a demo (which is actually rather good) of Rainbow Six: Vegas should by no means be played by people in America before those in Europe!

In case you were unaware, you can become one of the chosen millions with access to this or that piece of content simply by creating an Xbox Live Silver account in another country. People based in the UK, for example, may want a US account to download South Park or some such show.

However, up to this point, it's all been above board with MS, who hadn't really spoken up about said problem. According to German site Xbox Archiv, a confidential plan was leaked to them, presumably via Microsoft. It has taken down the article since, and attempts to contact Microsoft's UK representative have been met with a stern "no comment."
While some people are put off by this account hogging (Gamertags are bloody hard to come by, though I think I had a lucky break with Refridgeron), it's more about contractual details between Microsoft and, say, Comedy Central. I think Eurogamer said it simplest.

Via Eurogamer