Title:
【発明の名称】条件付きアクセスシステムにおける不正なアクセスを防止する方法および装置
Document Type and Number:
Japanese Patent JP2001519980
Kind Code:
A
Abstract:
A receiver/decoder is programmed only to accept a current entitlement control message (EMM) if it has received at least a previous EMM of a previous calendar period. When this is received, it is used to check present rights in the receiver/decoder. The invention prevents an original subscriber from fraudulently obtaining rights by disconnecting a decoder (before an authorising message can update the decoder's memory to prevent decryption) and by reconnecting the decoder (so as to be mistaken for a new subscriber legitimately having those rights).
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Inventors:
Maillard, Michael
Application Number:
JP54323098A
Publication Date:
October 23, 2001
Filing Date:
March 19, 1998
Export Citation:
Assignee:
Canal Plus Society Anonymous
International Classes:
G06F9/06; G06F9/46; G06F9/48; G06F9/445; G06F11/00; G06F11/08; G06F11/10; G06F11/26; G06F11/28; G06F12/00; G06F12/02; G06F13/00; G06F13/10; G06F21/10; G06K17/00; G06K19/00; G06K19/07; G06Q20/00; G06T9/00; G07F7/00; G07F7/02; G07F7/08; G07F7/10; G09C1/00; G11C8/06; G11C16/02; H04B1/713; H04H20/02; H04H40/00; H04L1/00; H04L9/10; H04L9/32; H04L12/56; H04L13/08; H04L29/10; H04N5/00; H04N5/222; H04N5/455; H04N7/14; H04N7/16; H04N7/167; H04N7/173; H04N7/26; H04N7/66; H04N17/00; H04N17/04; H04N21/4367; H04N21/442; H04N21/462; H04N21/4623; H04N21/4627; H04N21/6334; H04N21/8355; G06F11/14; H04N5/44; H04N; (IPC1-7): H04N7/167; H04H1/00; H04L9/32
Attorney, Agent or Firm:
Takehiko Saito (1 outside)