USRE40334E1 - Method and apparatus for encrypted data stream transmission - Google Patents

Method and apparatus for encrypted data stream transmission Download PDF

Info

Publication number
USRE40334E1
USRE40334E1 US11/332,806 US33280606A USRE40334E US RE40334 E1 USRE40334 E1 US RE40334E1 US 33280606 A US33280606 A US 33280606A US RE40334 E USRE40334 E US RE40334E
Authority
US
United States
Prior art keywords
decoder
key
data stream
encrypted
security module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US11/332,806
Other languages
English (en)
Inventor
Michel Maillard
Christian Benardeau
Jean-Luc Dauvois
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nagra France SAS
Original Assignee
Nagra Thomson Licensing SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27238734&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=USRE40334(E1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US09/537,071 external-priority patent/US6286103B1/en
Application filed by Nagra Thomson Licensing SA filed Critical Nagra Thomson Licensing SA
Priority to US11/332,806 priority Critical patent/USRE40334E1/en
Assigned to NAGRA THOMSON LICENSING reassignment NAGRA THOMSON LICENSING CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: CANAL + TECHNOLOGIES
Application granted granted Critical
Publication of USRE40334E1 publication Critical patent/USRE40334E1/en
Assigned to NAGRA FRANCE SAS reassignment NAGRA FRANCE SAS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAGRA THOMSON LICENSING
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/23—Arrangements for conditional access to broadcast information or to broadcast-related services using cryptography, e.g. encryption, authentication, key distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
    • H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
    • H04N21/4183—External card to be used in combination with the client device, e.g. for conditional access providing its own processing capabilities, e.g. external module for video decoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4367—Establishing a secure communication between the client and a peripheral device or smart card
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption

Definitions

  • the present invention overcomes the problems with these techniques.
  • Communication of the decoder identity value to the security module will necessarily involve a signal being sent from the decoder to the security module. As we have seen, the transmission of messages across this channel is relatively easy to monitor and it is thus preferable to transfer the identity value in a non-readable form to the security module.
  • Personalised keys of this type are known in relation to EMMs or Entitlement Management Messages, which transmit each month is encrypted form a management key for decrypting that month's ECM to a selected subscriber or group of subscribers possessing the necessary personalised key to decrypt the EMM.
  • the second decoder key is encrypted by a third key before communication to the decoder, the decoder possessing the corresponding third key so as to decrypt and verify the second decoder key.
  • the data stream is re-encrypted by a first encryption key held in the security module before being passed to the decoder.
  • the digital video signal is first compressed (or bit rate reduced), using the MPEG-2 compressor 2002 .
  • This compressed signal is then transmitted to the multiplexer and scrambler 2004 via the linkage 2006 in order to be multiplexed with other data, such as other compressed data.
  • FIG. 5 represents the flow of information in this embodiment between the transmitter 2008 , smart card 3020 and decoder 2020 .
  • this figure shows the information being transmitted directly between transmitter and smart card in order to simplify the explanation, any signals received by the smart card will have of course been received and communicated to the card via the receiver/decoder unit.
  • the transmitter has been represented as a single functional block in this case, the encryption of the transmitted message may be carried out by separate elements of the system, as described in relation to FIGS. 1 and 2 .
  • the data will still be in an encrypted from f(DATA) and will be passed in this form to the decoder 2020 for decryption at the point 3052 .
  • the decoder 2020 also possesses an equivalent of the key Kt and, if universally available information such as time and/or date is used, will also be in possession of the value t.
  • the data may then be decrypted and processed by decoder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Communication Control (AREA)
  • Storage Device Security (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Buffer Packaging (AREA)
  • Materials For Medical Uses (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Circuits Of Receivers In General (AREA)
  • Computer And Data Communications (AREA)
US11/332,806 1997-10-02 2006-01-13 Method and apparatus for encrypted data stream transmission Expired - Lifetime USRE40334E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/332,806 USRE40334E1 (en) 1997-10-02 2006-01-13 Method and apparatus for encrypted data stream transmission

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP97402322 1997-10-02
EP98401389 1998-06-09
EP98401388 1998-06-09
PCT/IB1998/001610 WO1999018729A1 (en) 1997-10-02 1998-10-02 Method and apparatus for encrypted data stream transmission
US09/537,071 US6286103B1 (en) 1998-10-02 2000-03-28 Method and apparatus for encrypted data stream transmission
US11/332,806 USRE40334E1 (en) 1997-10-02 2006-01-13 Method and apparatus for encrypted data stream transmission

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/537,071 Reissue US6286103B1 (en) 1997-10-02 2000-03-28 Method and apparatus for encrypted data stream transmission

Publications (1)

Publication Number Publication Date
USRE40334E1 true USRE40334E1 (en) 2008-05-20

Family

ID=27238734

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/332,806 Expired - Lifetime USRE40334E1 (en) 1997-10-02 2006-01-13 Method and apparatus for encrypted data stream transmission

Country Status (19)

Country Link
US (1) USRE40334E1 (zh)
EP (1) EP1020080B1 (zh)
JP (1) JP2001519629A (zh)
KR (1) KR100672983B1 (zh)
CN (1) CN1171454C (zh)
AT (1) ATE273597T1 (zh)
AU (1) AU748518B2 (zh)
BR (1) BRPI9812703B1 (zh)
CA (1) CA2305644A1 (zh)
DE (1) DE69825611T2 (zh)
ES (1) ES2236937T3 (zh)
HR (1) HRP20000165A2 (zh)
HU (1) HUP0100232A3 (zh)
ID (1) ID23916A (zh)
IL (1) IL135413A0 (zh)
NO (1) NO325610B1 (zh)
PL (1) PL339572A1 (zh)
TR (1) TR200001560T2 (zh)
WO (1) WO1999018729A1 (zh)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050286721A1 (en) * 2004-06-29 2005-12-29 Nokia Corporation Providing content in a communication system
US9934408B2 (en) 1999-08-04 2018-04-03 Wistaria Trading Ltd Secure personal content server
US10110379B2 (en) 1999-12-07 2018-10-23 Wistaria Trading Ltd System and methods for permitting open access to data objects and for securing data within the data objects
US10327136B2 (en) * 2008-04-14 2019-06-18 Koninklijke Philips N.V. Method for distributed identification, a station in a network
US10461930B2 (en) 1999-03-24 2019-10-29 Wistaria Trading Ltd Utilizing data reduction in steganographic and cryptographic systems
US10735437B2 (en) 2002-04-17 2020-08-04 Wistaria Trading Ltd Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US11184149B2 (en) * 2019-02-19 2021-11-23 International Business Machines Corporation Computing range queries over encrypted data

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999030499A1 (en) * 1997-12-10 1999-06-17 Thomson Consumer Electronics, Inc. Method for protecting the audio/visual data across the nrss inte rface
TW412909B (en) † 1998-05-07 2000-11-21 Kudelski Sa Mechanism of matching between a receiver and a security module
US7068787B1 (en) * 1998-10-23 2006-06-27 Contentguard Holdings, Inc. System and method for protection of digital works
US7415110B1 (en) 1999-03-24 2008-08-19 Intel Corporation Method and apparatus for the generation of cryptographic keys
US7336785B1 (en) * 1999-07-09 2008-02-26 Koninklijke Philips Electronics N.V. System and method for copy protecting transmitted information
US6920221B1 (en) 1999-08-29 2005-07-19 Intel Corporation Method and apparatus for protected exchange of status and secret values between a video source application and a video hardware interface
US7068786B1 (en) 1999-08-29 2006-06-27 Intel Corporation Dual use block/stream cipher
US6731758B1 (en) 1999-08-29 2004-05-04 Intel Corporation Digital video content transmission ciphering and deciphering method and apparatus
US6477252B1 (en) 1999-08-29 2002-11-05 Intel Corporation Digital video content transmission ciphering and deciphering method and apparatus
US6947558B1 (en) 1999-08-29 2005-09-20 Intel Corporation Stream cipher having a shuffle network combiner function
KR100605825B1 (ko) * 1999-09-14 2006-07-31 삼성전자주식회사 하드 디스크 드라이브를 구비하는 방송 수신 시스템의 복사 방지장치 및 방법
DE19957466A1 (de) * 1999-11-24 2001-05-31 Deutsche Telekom Ag Verfahren zur Verteilung von Kino-Programmen
PT1166562E (pt) * 2000-01-05 2011-09-05 Nds Ltd Sistema e método de entrega de conteúdo digital
US7003107B2 (en) 2000-05-23 2006-02-21 Mainstream Encryption Hybrid stream cipher
JP4691244B2 (ja) * 2000-11-10 2011-06-01 株式会社東芝 限定受信システムの限定受信装置及びセキュリティモジュール、限定受信システム、限定受信装置認証方法及び暗号通信方法
JP2002281476A (ja) * 2001-03-15 2002-09-27 Matsushita Electric Ind Co Ltd デジタル放送限定受信装置
FR2825877B1 (fr) 2001-06-12 2003-09-19 Canal Plus Technologies Procede de controle d'acces a un programme crypte
FR2828781B1 (fr) * 2001-08-14 2003-11-14 At Sky Systeme de securisation du desembrouillage des donnees numeriques sur un poste client ouvert
US7409562B2 (en) * 2001-09-21 2008-08-05 The Directv Group, Inc. Method and apparatus for encrypting media programs for later purchase and viewing
IL155416A0 (en) 2003-04-13 2003-11-23 Nds Ltd System for securing access to data streams
TW200511860A (en) * 2003-05-14 2005-03-16 Nagracard Sa Duration computing method in a security module
EP1492346A1 (fr) * 2003-06-23 2004-12-29 Nagracard S.A. Système de traitement simultané de données d'au moins deux services de télévision à péage
EP1523188A1 (en) 2003-10-06 2005-04-13 Canal + Technologies Portable security module pairing
FR2865592A1 (fr) * 2004-01-28 2005-07-29 Noel Vogt Procede de diffusion securisee de programmes de television, systeme de diffusion, decodeur et support de donnees correspondants.
EP1662788A1 (fr) * 2004-11-24 2006-05-31 Nagravision SA Unité de traitement de données audio/vidéo numériques et méthode de contrôle d'accès audites données
KR100820810B1 (ko) * 2005-04-29 2008-04-10 엘지전자 주식회사 디지털 수신 시스템의 제한 수신 방법
US9325944B2 (en) 2005-08-11 2016-04-26 The Directv Group, Inc. Secure delivery of program content via a removable storage medium
FR2890267B1 (fr) * 2005-08-26 2007-10-05 Viaccess Sa Procede d'etablissement d'une cle de session et unites pour la mise en oeuvre du procede
EP1784016A1 (fr) 2005-11-03 2007-05-09 Nagravision S.A. Méthode de sécurisation de données échangées entre un dispositif de traitement multimédia et un module de sécurité
US8775319B2 (en) 2006-05-15 2014-07-08 The Directv Group, Inc. Secure content transfer systems and methods to operate the same
US8996421B2 (en) 2006-05-15 2015-03-31 The Directv Group, Inc. Methods and apparatus to conditionally authorize content delivery at broadcast headends in pay delivery systems
US7992175B2 (en) 2006-05-15 2011-08-02 The Directv Group, Inc. Methods and apparatus to provide content on demand in content broadcast systems
US9225761B2 (en) 2006-08-04 2015-12-29 The Directv Group, Inc. Distributed media-aggregation systems and methods to operate the same
US9178693B2 (en) 2006-08-04 2015-11-03 The Directv Group, Inc. Distributed media-protection systems and methods to operate the same
EP2018059A1 (en) * 2007-07-19 2009-01-21 Panasonic Corporation Digital video broadcast receiver and method for decrypting of digital data streams
US9143493B2 (en) 2007-12-20 2015-09-22 The Directv Group, Inc. Method and apparatus for communicating between a user device and a gateway device to form a system to allow a partner service to be provided to the user device
EP2091256A1 (en) 2008-02-18 2009-08-19 Nagravision S.A. Method for the removal of artefacts from a transmitted digital audio/video signal
EP2219374A1 (en) * 2009-02-13 2010-08-18 Irdeto Access B.V. Securely providing a control word from a smartcard to a conditional access module
EP2227014B1 (en) * 2009-03-02 2019-10-02 Irdeto B.V. Securely providing secret data from a sender to a receiver
EP2373019A1 (en) 2010-03-29 2011-10-05 Nagravision S.A. Secure descrambling of an audio / video data stream
CN102164319A (zh) * 2011-04-08 2011-08-24 北京数字太和科技有限责任公司 传输码流ts的安全传输方法和装置
US8745654B1 (en) 2012-02-09 2014-06-03 The Directv Group, Inc. Method and system for managing digital rights for content
US9467726B1 (en) 2015-09-30 2016-10-11 The Directv Group, Inc. Systems and methods for provisioning multi-dimensional rule based entitlement offers

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5185794A (en) * 1990-08-06 1993-02-09 Nec Home Electronics, Ltd. System and method for scrambling and/or descrambling a video signal
EP0599366A1 (fr) * 1992-11-26 1994-06-01 Schlumberger Industries Réseau de communication
US5406627A (en) * 1990-08-06 1995-04-11 Nec Home Electronics, Ltd. Digital data cryptographic system
WO1996006504A1 (en) * 1994-08-19 1996-02-29 Thomson Consumer Electronics, Inc. Smart-card based access control system with improved security
WO1997038530A1 (en) * 1996-04-03 1997-10-16 Digco B.V. Method for providing a secure communication between two devices and application of this method
EP0843438A2 (en) * 1996-11-13 1998-05-20 THOMSON multimedia Process for protecting an information item transmitted from a security element to a decoder and protection system using such a process
US5774548A (en) * 1995-09-05 1998-06-30 Hitachi, Ltd. Digital broadcast transmitting and receiving system and transmitting and receiving apparatus thereof
US6061451A (en) * 1996-09-03 2000-05-09 Digital Vision Laboratories Corporation Apparatus and method for receiving and decrypting encrypted data and protecting decrypted data from illegal use

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5185794A (en) * 1990-08-06 1993-02-09 Nec Home Electronics, Ltd. System and method for scrambling and/or descrambling a video signal
US5406627A (en) * 1990-08-06 1995-04-11 Nec Home Electronics, Ltd. Digital data cryptographic system
US5406627B1 (en) * 1990-08-06 1997-02-04 Nippon Denki Home Electronics System and method for transmitting entertainment information to authorized ones of plural receivers
EP0599366A1 (fr) * 1992-11-26 1994-06-01 Schlumberger Industries Réseau de communication
WO1996006504A1 (en) * 1994-08-19 1996-02-29 Thomson Consumer Electronics, Inc. Smart-card based access control system with improved security
US5774548A (en) * 1995-09-05 1998-06-30 Hitachi, Ltd. Digital broadcast transmitting and receiving system and transmitting and receiving apparatus thereof
WO1997038530A1 (en) * 1996-04-03 1997-10-16 Digco B.V. Method for providing a secure communication between two devices and application of this method
US6061451A (en) * 1996-09-03 2000-05-09 Digital Vision Laboratories Corporation Apparatus and method for receiving and decrypting encrypted data and protecting decrypted data from illegal use
EP0843438A2 (en) * 1996-11-13 1998-05-20 THOMSON multimedia Process for protecting an information item transmitted from a security element to a decoder and protection system using such a process

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Bruce Schneier, Applied Cryptography, 1996, John Wiley & Sons Inc., Second Edition, pp. 176, 398, 399. *
Schneier, "Applied Cryptography", 1995, pp. 176, 398, 399. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10461930B2 (en) 1999-03-24 2019-10-29 Wistaria Trading Ltd Utilizing data reduction in steganographic and cryptographic systems
US9934408B2 (en) 1999-08-04 2018-04-03 Wistaria Trading Ltd Secure personal content server
US10110379B2 (en) 1999-12-07 2018-10-23 Wistaria Trading Ltd System and methods for permitting open access to data objects and for securing data within the data objects
US10644884B2 (en) 1999-12-07 2020-05-05 Wistaria Trading Ltd System and methods for permitting open access to data objects and for securing data within the data objects
US10735437B2 (en) 2002-04-17 2020-08-04 Wistaria Trading Ltd Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US20050286721A1 (en) * 2004-06-29 2005-12-29 Nokia Corporation Providing content in a communication system
US7765404B2 (en) * 2004-06-29 2010-07-27 Nokia Corporation Providing content in a communication system
US10327136B2 (en) * 2008-04-14 2019-06-18 Koninklijke Philips N.V. Method for distributed identification, a station in a network
US11184149B2 (en) * 2019-02-19 2021-11-23 International Business Machines Corporation Computing range queries over encrypted data

Also Published As

Publication number Publication date
CN1280742A (zh) 2001-01-17
WO1999018729A1 (en) 1999-04-15
BR9812703A (pt) 2000-08-22
TR200001560T2 (tr) 2000-12-21
ID23916A (id) 2000-05-25
BRPI9812703B1 (pt) 2015-12-15
DE69825611D1 (de) 2004-09-16
HUP0100232A2 (hu) 2001-05-28
HRP20000165A2 (en) 2001-04-30
KR20010030925A (ko) 2001-04-16
NO20001649L (no) 2000-06-02
ES2236937T3 (es) 2005-07-16
CA2305644A1 (en) 1999-04-15
CN1171454C (zh) 2004-10-13
ATE273597T1 (de) 2004-08-15
EP1020080A1 (en) 2000-07-19
AU9278298A (en) 1999-04-27
NO20001649D0 (no) 2000-03-30
HUP0100232A3 (en) 2001-10-29
EP1020080B1 (en) 2004-08-11
JP2001519629A (ja) 2001-10-23
IL135413A0 (en) 2001-05-20
AU748518B2 (en) 2002-06-06
NO325610B1 (no) 2008-06-23
KR100672983B1 (ko) 2007-01-22
DE69825611T2 (de) 2005-06-30
PL339572A1 (en) 2000-12-18

Similar Documents

Publication Publication Date Title
USRE40334E1 (en) Method and apparatus for encrypted data stream transmission
US6286103B1 (en) Method and apparatus for encrypted data stream transmission
AU766812B2 (en) Method and apparatus for encrypted transmission
AU754015B2 (en) Method and apparatus for recording of encrypted digital data
EP1099348B1 (en) Method and apparatus for secure communication of information between a plurality of digital audiovisual devices
EP0912052A1 (en) Method and apparatus for recording of encrypted digital data
US20090238363A1 (en) Method and a system for receiving a multimedia signal, a cryptographic entity for said reception method and system, and a method and a black box for producing said cryptographic entity
MXPA00003215A (en) Method and apparatus for encrypted data stream transmission
ZA200100325B (en) Method and apparatus for secure communication of information between a plurality of digital audiovisual devices.

Legal Events

Date Code Title Description
AS Assignment

Owner name: NAGRA THOMSON LICENSING, FRANCE

Free format text: CHANGE OF NAME;ASSIGNOR:CANAL + TECHNOLOGIES;REEL/FRAME:019589/0036

Effective date: 20040621

FPAY Fee payment

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

AS Assignment

Owner name: NAGRA FRANCE SAS, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NAGRA THOMSON LICENSING;REEL/FRAME:028190/0095

Effective date: 20110616

FPAY Fee payment

Year of fee payment: 12