Cartivision: '70s home tape system had physical DRM

Dan Rutter has a wonderful retrospective on the first wave of home video recording systems, casting his wistful eye on 1972 and the launch of the "Cartivision." Like all dabbling attempts to release media, it appears that Cartivision also had their own corny proto-DRM scheme in place that contributed at least in part to its quick demise.

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