Sony KDF-55WF655 - Manual (Page 3)

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In addition to the electronics typically found in most television sets, a DCR product
incorporates many of the same electronics found in a digital set-top box. The key
difference is that a DCR product does not itself contain technology that will allow the
television to display encrypted digital signals. Such decryption technology is instead
built into the CableCARD™. Since cable operators encrypt most digital cable signals
(other than, e.g., retransmitted local broadcast digital TV programming), a
CableCARD™ must be inserted into a DCR product in order for that product to receive
most digital cable programming.