...but only $8.95/mo for the same sports pack for waiting room TVs and other "office" uses: http://business.comcast.com/tv/offices/plans-pricing
Because Comcast uses cable (instead of satellite), they actually have two-way communication with most of their equipment. And even one-way-only equipment (like CableCard and DTA) can still be restricted to only work on the encryption keys for a very small geographical area. If Comcast equipment is moved to a location other than the address where it's supposed to be, it usually won't work.
For what it's worth, a lot of bars and restaurants use DirecTV (it has popular exclusive sports packages). Even though it's satellite-based, I've never noticed any sort of "pub glass" or the licensing indicator. So I'm not sure how they enforce licensing.