Thanks for the info.
Glad to see there is a way of getting around Microsoft's region checking as I'm sure there are some disappointed customers who bought one or more HD WMV discs in assumption that they will playback without issue outside the US and Canada.
I tried a Brazil proxy from the list in Internet Explorer, went to Google.com and got Google Brazil I did not realise there were any free ones out there as most anonymous proxy servers I came across require a subscription.
When using a US proxy and go to Google.com, is should should come up with the basic non-country specific version of Google, for example not Google UK, etc. Once your disc has been authenticated, be sure to turn off the proxy (or revert back to your old one), otherwise your browsing performance will be significantly reduced.
It would be better of Microsoft to perform a region check on the DVD player itself rather than resort to its online service. They probably do this for tracking purposes to count up how many are watching their movies. For several months, I always kept my multimedia PC off the Internet, but ever since I wanted to view the DRM protected WMV-HD trailers, I had no choice but to network this PC with my other PC (connected via satellite Internet) just to authenticate the clips.