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You need to use the Spectrum/TWC cable box OR a cable box that accepts a CableCard, and rent the CableCard from Spectrum. The CableCard provides the authentication that unlocks the encrypted digital signals for the non-Spectrum cable box.
No, most online cable boxes are stolen as well. Buy a Tivo and rent a cablecard and tuning adapter, no cost savings for years...
Very true that you won't break even for years, but the user experience is 10 times better than a rented box.