lets just settle this, there is no way, I used to be a supervisor for ct and nyc cable modem by cablevision and you can kiss that idea good bye... really, u need to know the guy at the headend... or pay for it..
and btw, for a fact, the old lancity has the capability for the headend to log on and change firmware, check levels of the signal at tap, at the modem and see your NIC MAC which they're not able to so claim by many. the newer modem probably have the same feature so if u can uncap, they can cap again..