Back in December, I noted that Update Rollup 1 for Media Center Extender devices (not Xbox) was available. This update fixed some bugs and added support for playback of TV programs using the CGMS-A broadcast flag such as HBO (no, it's not MS technology but we have to honor it).
The good news is that as of yesterday, Media Center Extender for Xbox-customers can get an update to play back CGMS-A protected content. The core update is available via Xbox Live for download , however viewing CGMS-A protected programs requires new Extender for Xbox discs. To obtain the new discs, click here (reg req'd).
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.