Thanks to Fieldhouse over in the forums for pointing this out:
Cable subscribers should soon be able to stream cable TV programming over their home networks, as CableLabs has announced its approval of a new streaming protocol. Called DTCP-IP (Digital Transmission Copy Protection), the new spec will use DRM to lock down content to ensure that it doesn’t escape the cozy confines of cable subscribers’ homes.
This sounds great, but as ever with things like this i will believe it when i see it and how long would it take Microsoft to implement something like this in Media Center? With the current pace of development it could be some time. Read the article for more details