Cryptography people: using modern primitives, how would you build pay-per-view cable-tv style encryption? Assume a unidirectional and broadcast channel (everyone gets the same data, and can't send) because that's the hard part. Digital video though, not analog.
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Doesn’t the fact that I paid mean I had to at least call out once from the device?
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No! Typically a cable subscriber has to phone their provider, or log into web site to subscribe. They give their decoder ID, or their account, and the provider "unlocks" the content for their decoder.
End of conversation
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Another option may be (assuming I paid from my Comcast account on a separate device or something) is to bake a key into the hardware and then use derived keys or something for the content?
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