Title:
AUTHORIZATION OF SERVICES IN CONDITIONAL ACCESS SYSTEM
Document Type and Number:
Japanese Patent JP2005341606
Kind Code:
A
Abstract:
To provide a cable television system which provides conditional access to services.
The cable television system includes a headend from which service "instances" or programs are broadcast and a plurality of set top units for receiving the instances and selectively decrypting the instances for display to system subscribers. The service instances are encrypted using public and/or private keys provided by service providers or central authorization agents. Keys used by the set tops for selective description may also be public or private in nature, and such keys may be reassigned at different times to provide a cable television system in which piracy concerns are minimized.
Inventors:
AKINS GLENDON L III
BANKER ROBERT O
PINDER HOWARD G
WASILEWSKI ANTHONY J
BANKER ROBERT O
PINDER HOWARD G
WASILEWSKI ANTHONY J
Application Number:
JP2005181317A
Publication Date:
December 08, 2005
Filing Date:
June 21, 2005
Export Citation:
Assignee:
SCIENTIFIC ATLANTA
International Classes:
G09C1/00; H04L9/08; H04L9/32; H04L29/06; H04N7/16; H04N7/167; (IPC1-7): H04N7/16; H04L9/32
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita
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