CONDITIONAL ACCESS SYSTEM
First Claim
Patent Images
1. An apparatus comprising:
- a transmitter configured to;
transmit control messages associated with decoding a scrambled broadcast stream separately from the scrambled broadcast stream if access is authorized; and
not transmit the control messages if access is not authorized,wherein access is authorized when a subscription exists between a user and a service provider in a home network region.
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Abstract
A conditional access system in which entitlement control messages (ECMs) containing the encryption keys used to encrypt a program transmission, are sent to a set-top box over a secure communications channel separate from the channel used for transmission of the encrypted program.
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Citations
20 Claims
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1. An apparatus comprising:
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a transmitter configured to; transmit control messages associated with decoding a scrambled broadcast stream separately from the scrambled broadcast stream if access is authorized; and not transmit the control messages if access is not authorized, wherein access is authorized when a subscription exists between a user and a service provider in a home network region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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determining whether a subscription exists between a user and a service provider in a home network region; and in response to determining that the subscription exists, transmitting control messages associated with decoding a scrambled broadcast stream separately from the scrambled broadcast stream. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification