I want to be clear about something, because I think you might misunderstand. S-card is "S" because it can decrypt a single stream (i.e. one service at a time). M-card is "M" because it can decrypt multiple streams (i.e. two services at a time, possibly more) There are two Cablecard protocol versions currently. 1.0 and 2.0. 1.0 Cablecard is unidirectional communication, i.e. it only reads the incoming signal from the headend, it cannot communicate back. 2.0 is bidirectional, it can both snag incoming data, but also communicate back to the headend. So to say, "we don't have M-cards, we only have one-way cards" would suggest someone somewhere is thinking that M-cards are bi-directional, which is not (or might not) be the case. Most domestic Cable providers (if not all, it's hard for me to keep track) are only complying with the Cablecard 1.0 standard, IMH, this is for their own selfish, greedy ass reasons (they make more money via STB rentals and cut down on overhead costs with support and service). A few of the partners (operators) overseas that I work with on a regular basis actually do support 2.0, and it's great - you just plug your S-card or M-card into the slot on your TV, no STB needed, and you can decrypt video. great for streamlined installations. Anyway, sorry if you already know all of this. Your post seemed as if someone didn't know what they were talking about (either you or the support agent), so I thought it might be a good idea to clarify.