Conditional access system and smartcard allowing such access

Cryptography – Key management – Having particular key generator

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380 9, 380 10, 380 20, 380 21, 380 23, 380 25, 380 49, 235380, 34082531, 34082534, 348 6, H04N 7167, H04L 908, H04L 932

Patent

active

060350385

ABSTRACT:
The conditional access system of the present invention allows a service provider to supply services, which may be scrambled by a control word, only to those users who have acquired entitlements to these services. The control word is supplied in Entitlement Control Messages (ECM) after having been encrypted using a key. The entitlements of each user are forwarded in Entitlement Management Messages which contain the key. The conditional access system verifies and validates the ECM and EMM prior to processing the control word.

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patent: 5588058 (1996-12-01), Le Berre
patent: 5793427 (1998-08-01), Mills et al.
Ute C90-007, dated Jan. 1994, published by "Union Technique de L'Electricite" entitled "Access control system for digital broadcasting systems" translated into English.
French Patent Office Search Report--Mar. 10, 1997.
A Derwent Abstract of reference AM in English language.
UTE C90-007, dated Jan. 1994, published by "Union Technique de l'Electricite" entitled "Access control system for digital broadcasting systems" in French language.

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