https://techcrunch.com/2008/05/29/cablecard-goes-two-way-with-new-specs/
CableCARD goes two-way with new specs | TechCrunch
While CableCARD technology is still alien to most people, the development goes on. The latest advancements include two-way card communications, meaning
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https://www.blondertongue.com/end-of-life-cablecard-solution/
End of Life CABLECARD Solution | Blonder Tongue Laboratories
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