ARS Technica wrote an article about Windows Vista's CableCARD implementation which is more limited than expected.
The newest one concerns streaming—Windows Vista will only allow CableCARD-decrypted video to be streamed to official Media Center Extenders.
Consumers who hoped to use their new Vista boxes to blast recorded TV content to other PCs on their home network or to a laptop while traveling (much like a SlingBox) will be disappointed, as Vista engineers bowed to the cable industry's demand for content protection by enabling streaming only to Media Center Extenders. The story first appeared at CE Pro, which learned of the limitations from some Microsoft folks in attendance at the recent Electronic House Expo. Ars Technica has been able to confirm this with sources in the know, but official public relations channels aren't commenting.