Over the next year or two, Comcast will finally catch up with all their competitors in that regard, and present cable networks (TNT, USA, CNN, ESPN, etc.) in digital, requiring a box on every analog television. In addition, just like all their competitors already do, they will likely encrypt most of their advanced services, to discourage theft of service.
What they won't do is encrypt basic cable, i.e., your local over-the-air broadcast channels (ABC, NBC, CBS, Fox, CW). Those channels will remain in-the-clear. In addition, until at least 2012, they'll be providing those local over-the-air broadcast channels both as digital and analog signals, so you'll even be able to tune in local over-the-air broadcast channels with older televisions, without a box.
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