Cablevision was one of the few (only?) US wins for VideoGuard (NDS) CableCARD CA. At some point (I have lost track of the when) Cisco bought NDS, so now had both PowerKey and NDS. Cisco (apparently) offered an attractive migration to PowerKey, and Cablevision took that off-ramp from VideoGuard (NDS). NDS, as I recall, had some specific operational particularities that were sufficiently different than the classic SCTE-55 approaches that was codified for the Motoroa and Scientific Atlanta solutions, which was probably another nail in its coffin.FYI. A while back about a year ago Optimum stopped support for their old CC (NDS I think). They required a swap to a Powerkey card. As of today, my Powerkey cards on Optimum are functioning along with tuning adapters for both my Tivo bolt 3gb and HD Homerun.