CA2137616A1 - Method and apparatus for controlling access to digital signals - Google Patents

Method and apparatus for controlling access to digital signals

Info

Publication number
CA2137616A1
CA2137616A1 CA002137616A CA2137616A CA2137616A1 CA 2137616 A1 CA2137616 A1 CA 2137616A1 CA 002137616 A CA002137616 A CA 002137616A CA 2137616 A CA2137616 A CA 2137616A CA 2137616 A1 CA2137616 A1 CA 2137616A1
Authority
CA
Canada
Prior art keywords
digital signals
controlling access
communication path
encryption scheme
decrypted
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.)
Granted
Application number
CA002137616A
Other languages
French (fr)
Other versions
CA2137616C (en
Inventor
Jeffrey S. Hamilton
Marc Kauffman
Lawrence D. Vince
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.)
Google Technology Holdings LLC
Original Assignee
General Instrument Corp
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
Application filed by General Instrument Corp filed Critical General Instrument Corp
Publication of CA2137616A1 publication Critical patent/CA2137616A1/en
Application granted granted Critical
Publication of CA2137616C publication Critical patent/CA2137616C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • 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
    • 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
    • H04N21/21—Server components or server architectures
    • H04N21/222—Secondary servers, e.g. proxy server, cable television Head-end
    • H04N21/2221—Secondary servers, e.g. proxy server, cable television Head-end being a cable television head-end
    • 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, manipulating MPEG-4 scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 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]
    • H04N21/40—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, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/633—Control signals issued by server directed to the network components or client
    • H04N21/6332—Control signals issued by server directed to the network components or client directed to client
    • H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
    • H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Computer And Data Communications (AREA)
  • Selective Calling Equipment (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

A method and apparatus are provided for controlling access to digital signals sent via a first communication path and retransmitted over a second communication path. The digital signals, having been encrypted by a first encryption scheme and sent over the first communication path, are received and decrypted. The decrypted signals are then retransmitted over the second communication path using a second encryption scheme that differs from the first encryption scheme.
CA002137616A 1994-02-02 1994-12-08 Method and apparatus for controlling access to digital signals Expired - Lifetime CA2137616C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/191,031 1994-02-02
US08/191,031 US5504816A (en) 1994-02-02 1994-02-02 Method and apparatus for controlling access to digital signals

Publications (2)

Publication Number Publication Date
CA2137616A1 true CA2137616A1 (en) 1995-08-03
CA2137616C CA2137616C (en) 2003-04-01

Family

ID=22703848

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002137616A Expired - Lifetime CA2137616C (en) 1994-02-02 1994-12-08 Method and apparatus for controlling access to digital signals

Country Status (9)

Country Link
US (1) US5504816A (en)
EP (1) EP0666694B1 (en)
JP (1) JPH08107412A (en)
KR (1) KR100371833B1 (en)
AU (1) AU676404B2 (en)
CA (1) CA2137616C (en)
DE (1) DE69428673T2 (en)
ES (1) ES2165862T3 (en)
NO (1) NO944678L (en)

Families Citing this family (125)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07271865A (en) 1994-04-01 1995-10-20 Mitsubishi Corp Method for managing copyright of data base
US7036019B1 (en) * 1994-04-01 2006-04-25 Intarsia Software Llc Method for controlling database copyrights
US6744894B1 (en) 1994-04-01 2004-06-01 Mitsubishi Corporation Data management system
US7302415B1 (en) * 1994-09-30 2007-11-27 Intarsia Llc Data copyright management system
US6741991B2 (en) * 1994-09-30 2004-05-25 Mitsubishi Corporation Data management system
EP1691316A1 (en) 1994-10-27 2006-08-16 Intarsia Software LLC Data copyright management system
DE69532434T2 (en) 1994-10-27 2004-11-11 Mitsubishi Corp. Device for file copyright management system
US6789197B1 (en) 1994-10-27 2004-09-07 Mitsubishi Corporation Apparatus for data copyright management system
US6424715B1 (en) 1994-10-27 2002-07-23 Mitsubishi Corporation Digital content management system and apparatus
US5652795A (en) * 1994-11-14 1997-07-29 Hughes Electronics Method and apparatus for an adapter card providing conditional access in a communication system
US6963859B2 (en) 1994-11-23 2005-11-08 Contentguard Holdings, Inc. Content rendering repository
JPH08263438A (en) * 1994-11-23 1996-10-11 Xerox Corp Distribution and use control system of digital work and access control method to digital work
KR0152788B1 (en) 1994-11-26 1998-10-15 이헌조 Copy protecting method and apparatus of digital image system
KR0136458B1 (en) 1994-12-08 1998-05-15 구자홍 Copy protection apparatus of digital magnetic recording and reproducing system
US5675645A (en) * 1995-04-18 1997-10-07 Ricoh Company, Ltd. Method and apparatus for securing executable programs against copying
US5627892A (en) * 1995-04-19 1997-05-06 General Instrument Corporation Of Delaware Data security scheme for point-to-point communication sessions
US5949883A (en) * 1995-09-28 1999-09-07 Entrust Technologies Ltd. Encryption system for mixed-trust environments
US8595502B2 (en) * 1995-09-29 2013-11-26 Intarsia Software Llc Data management system
US5659618A (en) * 1995-09-29 1997-08-19 Vlsi Technology, Inc. Multi-size cryptographic key system
US7801817B2 (en) * 1995-10-27 2010-09-21 Makoto Saito Digital content management system and apparatus
FI100563B (en) 1996-01-30 1997-12-31 Nokia Oy Ab Encryption of digital presentation objects during transmission and recording
US5996103A (en) * 1996-07-31 1999-11-30 Samsung Information Systems America Apparatus and method for correcting errors in a communication system
US5946052A (en) * 1996-08-01 1999-08-31 Thomson Consumer Electronics, Inc. System for acquiring and processing video data and program guides transmitted in different coding formats
US6016348A (en) * 1996-11-27 2000-01-18 Thomson Consumer Electronics, Inc. Decoding system and data format for processing and storing encrypted broadcast, cable or satellite video data
US5970386A (en) 1997-01-27 1999-10-19 Hughes Electronics Corporation Transmodulated broadcast delivery system for use in multiple dwelling units
US6104908A (en) * 1997-02-28 2000-08-15 Hughes Electronics Corporation System for and method of combining signals of combining signals of diverse modulation formats for distribution in multiple dwelling units
US6233684B1 (en) 1997-02-28 2001-05-15 Contenaguard Holdings, Inc. System for controlling the distribution and use of rendered digital works through watermaking
JPH10257098A (en) * 1997-03-07 1998-09-25 Sony Corp Communication route controller, communication route control method and communication route control unit
US6430199B1 (en) * 1998-03-27 2002-08-06 Telcordia Technologies, Inc. Method and system for distributing telephone and broadband services over the copper pairs within a service location
BR9904912A (en) * 1998-03-31 2000-06-20 Koninkl Philips Electronics Nv Process for modifying data in an encrypted data stream, and video processing device
JP4763866B2 (en) 1998-10-15 2011-08-31 インターシア ソフトウェア エルエルシー Method and apparatus for protecting digital data by double re-encryption
US6229895B1 (en) * 1999-03-12 2001-05-08 Diva Systems Corp. Secure distribution of video on-demand
KR100320183B1 (en) 1999-03-17 2002-01-10 구자홍 File encryption apparatus for digital data player
US7171567B1 (en) * 1999-08-02 2007-01-30 Harris Interactive, Inc. System for protecting information over the internet
US7151832B1 (en) 1999-11-18 2006-12-19 International Business Machines Corporation Dynamic encryption and decryption of a stream of data
US7177841B2 (en) * 2000-01-28 2007-02-13 Canon Kabushiki Kaisha Digital contents distribution system, digital contents distribution method, roaming server, information processor, and information processing method
US7203311B1 (en) * 2000-07-21 2007-04-10 The Directv Group, Inc. Super encrypted storage and retrieval of media programs in a hard-paired receiver and storage device
US8140859B1 (en) * 2000-07-21 2012-03-20 The Directv Group, Inc. Secure storage and replay of media programs using a hard-paired receiver and storage device
US7743259B2 (en) * 2000-08-28 2010-06-22 Contentguard Holdings, Inc. System and method for digital rights management using a standard rendering engine
US7913095B2 (en) 2000-08-28 2011-03-22 Contentguard Holdings, Inc. Method and apparatus for providing a specific user interface in a system for managing content
US7688803B1 (en) 2000-09-01 2010-03-30 Young Steven J System and method for coordinating between multiple telephony channels
US6963972B1 (en) * 2000-09-26 2005-11-08 International Business Machines Corporation Method and apparatus for networked information dissemination through secure transcoding
US7343324B2 (en) * 2000-11-03 2008-03-11 Contentguard Holdings Inc. Method, system, and computer readable medium for automatically publishing content
US7200859B1 (en) 2000-11-22 2007-04-03 Digeo, Inc. Apparatus and method for intelligent multimedia compression and distribution
US20020094089A1 (en) * 2000-12-28 2002-07-18 Shigeki Kamiya Data delivery method and data delivery system
US6912294B2 (en) * 2000-12-29 2005-06-28 Contentguard Holdings, Inc. Multi-stage watermarking process and system
US6647149B2 (en) 2001-01-03 2003-11-11 Electronics For Imaging, Inc. Methods and apparatus for securely transmitting and processing digital image data
US6813643B2 (en) 2001-01-05 2004-11-02 Digeo, Inc. Multimedia system with selectable protocol module including MPEG logic and docsis logic sharing a single tuner
JP4752113B2 (en) * 2001-01-16 2011-08-17 ソニー株式会社 Electronic device and signal transmission method
EP1352523B1 (en) * 2001-01-16 2004-08-04 Nagracard S.A. Method for storing encrypted data
US8069116B2 (en) * 2001-01-17 2011-11-29 Contentguard Holdings, Inc. System and method for supplying and managing usage rights associated with an item repository
US7774279B2 (en) * 2001-05-31 2010-08-10 Contentguard Holdings, Inc. Rights offering and granting
US7028009B2 (en) * 2001-01-17 2006-04-11 Contentguardiholdings, Inc. Method and apparatus for distributing enforceable property rights
US6754642B2 (en) * 2001-05-31 2004-06-22 Contentguard Holdings, Inc. Method and apparatus for dynamically assigning usage rights to digital works
US20040039704A1 (en) * 2001-01-17 2004-02-26 Contentguard Holdings, Inc. System and method for supplying and managing usage rights of users and suppliers of items
US20020116705A1 (en) * 2001-02-20 2002-08-22 Perlman Stephen G. System and method for processing conditional access data
US20020114360A1 (en) * 2001-02-20 2002-08-22 Perlman Stephen G. System and method for processing multiple broadcast multimedia streams
JP2002259170A (en) * 2001-02-23 2002-09-13 Samsung Electronics Co Ltd Apparatus and method for converting and copying data
US7046805B2 (en) 2001-03-20 2006-05-16 Digeo, Inc. System and method for efficiently storing and processing multimedia content
US7386129B2 (en) * 2001-05-30 2008-06-10 Digeo, Inc. System and method for multimedia content simulcast
US7093277B2 (en) * 2001-05-30 2006-08-15 Digeo, Inc. System and method for improved multi-stream multimedia transmission and processing
US7222104B2 (en) 2001-05-31 2007-05-22 Contentguard Holdings, Inc. Method and apparatus for transferring usage rights and digital work having transferrable usage rights
US8275709B2 (en) * 2001-05-31 2012-09-25 Contentguard Holdings, Inc. Digital rights management of content when content is a future live event
US20030009424A1 (en) * 2001-05-31 2003-01-09 Contentguard Holdings, Inc. Method for managing access and use of resources by verifying conditions and conditions for use therewith
US8099364B2 (en) * 2001-05-31 2012-01-17 Contentguard Holdings, Inc. Digital rights management of content when content is a future live event
US6876984B2 (en) 2001-05-31 2005-04-05 Contentguard Holdings, Inc. Method and apparatus for establishing usage rights for digital content to be created in the future
US8001053B2 (en) * 2001-05-31 2011-08-16 Contentguard Holdings, Inc. System and method for rights offering and granting using shared state variables
US7725401B2 (en) * 2001-05-31 2010-05-25 Contentguard Holdings, Inc. Method and apparatus for establishing usage rights for digital content to be created in the future
US6895503B2 (en) * 2001-05-31 2005-05-17 Contentguard Holdings, Inc. Method and apparatus for hierarchical assignment of rights to documents and documents having such rights
US8275716B2 (en) 2001-05-31 2012-09-25 Contentguard Holdings, Inc. Method and system for subscription digital rights management
EP1393230A4 (en) * 2001-06-07 2004-07-07 Contentguard Holdings Inc Method and apparatus managing the transfer of rights
EP1340134A4 (en) * 2001-06-07 2004-07-28 Contentguard Holdings Inc Method and apparatus for supporting multiple trust zones in a digital rights management system
US7774280B2 (en) 2001-06-07 2010-08-10 Contentguard Holdings, Inc. System and method for managing transfer of rights using shared state variables
US20020186769A1 (en) * 2001-06-12 2002-12-12 O'brien Royal System and method for transcoding
EP1271951A1 (en) * 2001-06-22 2003-01-02 Octalis S.A. Conditional access system for digital data by key decryption and re-encryption
US7065213B2 (en) * 2001-06-29 2006-06-20 Scientific-Atlanta, Inc. In a subscriber network receiving digital packets and transmitting digital packets below a predetermined maximum bit rate
DE60131270T2 (en) * 2001-07-26 2008-08-21 Irdeto Access B.V. Time Valid reasoning system
US7463737B2 (en) 2001-08-15 2008-12-09 Digeo, Inc. System and method for conditional access key encryption
EP1437856B1 (en) * 2001-10-19 2011-01-19 Pioneer Corporation Electronic device control system and method, and control apparatus
MXPA04004681A (en) * 2001-11-20 2004-09-10 Contentguard Holdings Inc An extensible rights expression processing system.
US7974923B2 (en) * 2001-11-20 2011-07-05 Contentguard Holdings, Inc. Extensible rights expression processing system
US7840488B2 (en) * 2001-11-20 2010-11-23 Contentguard Holdings, Inc. System and method for granting access to an item or permission to use an item based on configurable conditions
US7088823B2 (en) * 2002-01-09 2006-08-08 International Business Machines Corporation System and method for secure distribution and evaluation of compressed digital information
US7805371B2 (en) * 2002-03-14 2010-09-28 Contentguard Holdings, Inc. Rights expression profile system and method
US20030229593A1 (en) * 2002-03-14 2003-12-11 Michael Raley Rights expression profile system and method
US7359884B2 (en) * 2002-03-14 2008-04-15 Contentguard Holdings, Inc. Method and apparatus for processing usage rights expressions
CN1666207A (en) * 2002-04-29 2005-09-07 康坦夹德控股股份有限公司 Rights management system using legality expression language
US20040060074A1 (en) * 2002-09-19 2004-03-25 Ganesh Basawapatna Video distribution system with increased centralized processing
US7690022B2 (en) * 2002-10-02 2010-03-30 Ganesh Basawapatna Video distribution system for digital and analog subscribers
CN1729644B (en) * 2002-12-18 2011-08-31 三叉微系统(远东)有限公司 Dedicated encrypted virtual channel in a multi-channel serial communications interface
AU2003207129A1 (en) * 2003-02-10 2004-08-30 Rf Korea Inc. Multi-channel wireless tv receiving apparatus
US7685642B2 (en) * 2003-06-26 2010-03-23 Contentguard Holdings, Inc. System and method for controlling rights expressions by stakeholders of an item
US7564892B1 (en) * 2003-06-30 2009-07-21 Nxp B.V. Satellite transcoder
US7848303B2 (en) 2003-06-30 2010-12-07 Nxp B.V. Satellite multi-choice switch system
TW200509637A (en) 2003-07-14 2005-03-01 Nagravision Sa Method to create and manage a local network
US20050097593A1 (en) * 2003-11-05 2005-05-05 Michael Raley System, method and device for selected content distribution
IL159838A0 (en) 2004-01-13 2004-06-20 Yehuda Binder Information device
US7590243B2 (en) * 2004-05-04 2009-09-15 The Directv Group, Inc. Digital media conditional access system for handling digital media content
US20060107326A1 (en) * 2004-11-12 2006-05-18 Demartini Thomas Method, system, and device for verifying authorized issuance of a rights expression
US8660961B2 (en) 2004-11-18 2014-02-25 Contentguard Holdings, Inc. Method, system, and device for license-centric content consumption
US20060106726A1 (en) * 2004-11-18 2006-05-18 Contentguard Holdings, Inc. Method, system, and device for license-centric content consumption
US20060112015A1 (en) * 2004-11-24 2006-05-25 Contentguard Holdings, Inc. Method, system, and device for handling creation of derivative works and for adapting rights to derivative works
US20060248573A1 (en) * 2005-04-28 2006-11-02 Content Guard Holdings, Inc. System and method for developing and using trusted policy based on a social model
US20060271493A1 (en) * 2005-05-24 2006-11-30 Contentguard Holdings, Inc. Method and apparatus for executing code in accordance with usage rights
JP2006339988A (en) * 2005-06-01 2006-12-14 Sony Corp Stream controller, stream ciphering/deciphering device, and stream enciphering/deciphering method
US9325944B2 (en) * 2005-08-11 2016-04-26 The Directv Group, Inc. Secure delivery of program content via a removable storage medium
KR101322515B1 (en) * 2005-09-29 2013-10-25 콘텐트가드 홀딩즈 인코포레이티드 System and method for digital rights management using advanced copy with issue rights, and managed copy tokens
US7720767B2 (en) * 2005-10-24 2010-05-18 Contentguard Holdings, Inc. Method and system to support dynamic rights and resources sharing
JP4667235B2 (en) * 2005-12-28 2011-04-06 日本電信電話株式会社 Data distribution / reception system and data distribution / reception method
US20070265973A1 (en) * 2006-05-15 2007-11-15 The Directv Group, Inc. Methods and apparatus to protect content in home networks
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
US8001565B2 (en) * 2006-05-15 2011-08-16 The Directv Group, Inc. Methods and apparatus to conditionally authorize content delivery at receivers 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
US8095466B2 (en) * 2006-05-15 2012-01-10 The Directv Group, Inc. Methods and apparatus to conditionally authorize content delivery at content servers in pay delivery systems
US8775319B2 (en) * 2006-05-15 2014-07-08 The Directv Group, Inc. Secure content transfer systems and methods to operate the same
US20070265966A1 (en) * 2006-05-15 2007-11-15 The Directv Group, Inc. Content delivery systems and methods to operate the same
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
JP4536092B2 (en) * 2007-07-30 2010-09-01 日本放送協会 Conditional reception processing device
JP4536091B2 (en) * 2007-07-30 2010-09-01 日本放送協会 Processing apparatus and processing method for conditional access system
CN100562098C (en) * 2008-01-03 2009-11-18 济南市泰信电子有限责任公司 Digital television conditional access system and handling process thereof
FR2933564A1 (en) * 2008-07-02 2010-01-08 Thomson Licensing METHOD OF LOCKING AND UNLOCKING FOR THE TRANSPORT OF MPEG2 VIDEO AUDIO DATA FLOW
WO2011024298A1 (en) * 2009-08-28 2011-03-03 リプレックス株式会社 Service system
JP2012100352A (en) * 2012-02-09 2012-05-24 Ripplex Inc Service system
US20160188196A1 (en) * 2014-12-30 2016-06-30 Airwatch Llc Floating media player

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222068A (en) * 1978-11-02 1980-09-09 American Television And Communications Corporation Subscription television apparatus and methods
US4613901A (en) * 1983-05-27 1986-09-23 M/A-Com Linkabit, Inc. Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals
US4817146A (en) * 1984-10-17 1989-03-28 General Electric Company Cryptographic digital signal transceiver method and apparatus
GB2172127B (en) * 1985-03-06 1988-10-12 Ferranti Plc Data compression system
JP3143108B2 (en) * 1990-03-13 2001-03-07 株式会社日立製作所 File encryption method and file encryption system
JPH03291083A (en) * 1990-04-09 1991-12-20 Matsushita Electric Ind Co Ltd Key signal converter for catv system
US5144664A (en) * 1990-11-16 1992-09-01 General Instrument Corporation Apparatus and method for upgrading terminals to maintain a secure communication network
US5153918A (en) * 1990-11-19 1992-10-06 Vorec Corporation Security system for data communications
JP2781906B2 (en) * 1991-03-29 1998-07-30 パイオニア株式会社 CATV center device and program supply method in cable net
US5138659A (en) * 1991-05-02 1992-08-11 General Instrument Corporation Conversion of television signal formats with retention of common control data stream
US5173775A (en) * 1991-05-02 1992-12-22 General Instrument Corporation Reformatting of television signal data for transmission using a different modulation scheme
US5173900A (en) * 1991-05-17 1992-12-22 General Instrument Corporation Method and apparatus for communicating different categories of data in a single data stream
US5341425A (en) * 1992-12-02 1994-08-23 Scientific Atlanta, Inc. Methods and apparatus for uniquely encrypting data at a plurality of data transmission sites for transmission to a reception site

Also Published As

Publication number Publication date
KR950026251A (en) 1995-09-18
AU676404B2 (en) 1997-03-06
DE69428673T2 (en) 2002-07-11
ES2165862T3 (en) 2002-04-01
EP0666694A1 (en) 1995-08-09
US5504816A (en) 1996-04-02
AU8150894A (en) 1995-08-10
NO944678L (en) 1995-08-03
JPH08107412A (en) 1996-04-23
NO944678D0 (en) 1994-12-05
CA2137616C (en) 2003-04-01
DE69428673D1 (en) 2001-11-22
KR100371833B1 (en) 2003-04-26
EP0666694B1 (en) 2001-10-17

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