CN102761777B - Multiple-CA (conditional access) simulcrypt system and method - Google Patents

Multiple-CA (conditional access) simulcrypt system and method Download PDF

Info

Publication number
CN102761777B
CN102761777B CN201210269752.9A CN201210269752A CN102761777B CN 102761777 B CN102761777 B CN 102761777B CN 201210269752 A CN201210269752 A CN 201210269752A CN 102761777 B CN102761777 B CN 102761777B
Authority
CN
China
Prior art keywords
entitlement
message
control message
management message
server
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.)
Active
Application number
CN201210269752.9A
Other languages
Chinese (zh)
Other versions
CN102761777A (en
Inventor
陶圣华
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.)
Shandong Taixin Electronics Co Ltd
Original Assignee
Shandong Taixin Electronics Co Ltd
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 Shandong Taixin Electronics Co Ltd filed Critical Shandong Taixin Electronics Co Ltd
Priority to CN201210269752.9A priority Critical patent/CN102761777B/en
Publication of CN102761777A publication Critical patent/CN102761777A/en
Priority to PCT/CN2013/000872 priority patent/WO2014019336A1/en
Application granted granted Critical
Publication of CN102761777B publication Critical patent/CN102761777B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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]
    • H04N21/20—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
    • H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23103—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion using load balancing strategies, e.g. by placing or distributing content on different disks, different memories or different servers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The invention discloses a multiple-CA (conditional access) simulcrypt system. The multiple-CA simulcrypt system comprises a CA public server, a plurality of CA servers, a scrambling machine and a plurality of digital television terminals, wherein the CA servers and the CA public server perform two-way communication; the CA public server and the scrambling machine perform two-way communication; the scrambling machine and the digital television terminals perform one-way communication; the CA public server is used for receiving control words from the scrambling machine and transmitting the control words to the connected CA servers; simultaneously, the CA public server is used for processing received ECM (entitlement control message) and EMM (entitlement management message) from the CA servers to generate a new ECM and a new EMM, and transmitting the new ECM and the new EMM to the scrambling machine; and the scrambling machine transmits the received ECM and the received EMM to the digital television terminal. According to the multiple-CA simulcrypt system disclosed by the invention, a simulcrypt CA system is simply and conveniently added or changed and does not need to repeatedly configure and debug so that the problem of limitation of the number of simulcrypt CA systems is solved.

Description

A kind of many CA are with close system and method
Technical field
The present invention relates to digital television techniques field, particularly relate to a kind of many CA with close system and method.
Background technology
With close be a kind of cipher mode of Digital Television, refer to two or more CA(Conditional Access, condition reception) system carries out scrambling or encryption to same TS stream.The same Data Encryption Standard regulation of DVB-CA system, CSA(Common Scrambling Algorithm must defer in all CA manufacturers: Common Scrambling Algorithm) realize video, audio frequency and data message add/descrambling, simultaneously, all CA manufacturers all must develop respective ECM(Entitlement Control Message, Entitlement Control Message) and EMM(Entitlement Management Message, Entitlement Management Message) control program, to realize it to the authorization control of subscriber computer top box and management.There are many CA systems with in the same Operation Network of close permission, user can adopt different terminals to watch identical program, is conducive to carrying out fair competition between CA producer, develops skill and service level.
At present, CA is mainly multiple CA server with close mode and is connected with same scrambling machine, scrambling machine utilizes CW(ControlWord, control word) scrambling/encryption is carried out to TS stream, and CW is sent to respectively each CA server connected, CA server generates ECM, EMM Data Concurrent to scrambling machine according to CW and user profile, and scrambling machine issues terminal by broadcasting and television network after multiplexing for ECM, EMM and TS stream.This mode can realize many CA system with close, but there is certain defect.The interface be connected with CA server due to scrambling machine is limited, causes attachable CA number of servers limited, and then cause can be limited with close CA system quantity.In addition, this with close mode at present, often increase or change a kind of with close CA system; need the same close setting changing scrambling machine; and re-start debugging, and a large amount of problem is often there will be in the process of debugging, increase or replacing extremely bother with close CA system.
Summary of the invention
Object of the present invention be exactly in order to solve at present with close mode exist can limited with close CA system quantity, increase or change with close CA system trouble and the problem such as often to make mistakes, propose a kind of many CA with close system and method, it can increase simply and easily or change with close CA system, do not need to reset debugging to scrambling machine, and the quantity with close CA system can be made not to be subject to scrambling machine interface restricted number.
To achieve these goals, the present invention adopts following technical scheme:
A kind of many CA are with close system, and it comprises: CA public server, some CA servers, scrambling machine and some digital TV terminals, wherein:
CA server and the two-way communication of CA public server; CA public server and the two-way communication of scrambling machine; Scrambling machine and digital TV terminal one-way communication;
CA public server receives the control word from scrambling machine, and control word is sent to connected CA server;
Meanwhile, CA public server processes the Entitlement Control Message from CA server received and Entitlement Management Message, generates new Entitlement Control Message and Entitlement Management Message, and new Entitlement Control Message and Entitlement Management Message are sent to scrambling machine;
The Entitlement Control Message received and Entitlement Management Message are then sent to digital TV terminal by scrambling machine.
Adopt many CA with the same decryption method of close system, its step is:
1) scrambling machine generates control word, and control word is sent into CA public server, control word is sent to connected each CA server by CA public server;
2) each CA server generates Entitlement Control Message respectively according to control word and sends to CA public server; Meanwhile, each CA server also generates Entitlement Management Message and sends to CA public server;
3) CA public server increases corresponding Entitlement Control Message descriptor respectively before each Entitlement Control Message, and will add each Entitlement Control Message combination after Entitlement Control Message descriptor, generates new Entitlement Control Message;
CA public server still increases corresponding Entitlement Management Message descriptor before each Entitlement Management Message simultaneously, and will add each Entitlement Management Message after Entitlement Management Message descriptor as new Entitlement Management Message;
4) new Entitlement Control Message and new Entitlement Management Message are sent to scrambling machine by CA public server;
5) scrambling machine by the new Entitlement Control Message received and new Entitlement Management Message multiplexing with program stream after send to digital TV terminal;
6) digital TV terminal receives new Entitlement Control Message and new Entitlement Management Message and resolves, and completes the condition reception of program.
In described step 3), described Entitlement Control Message descriptor at least comprises the ID identifier of the CA system generating this Entitlement Control Message.
In described step 3), described Entitlement Management Message descriptor at least comprises the ID identifier of the CA system generating this Entitlement Management Message.
In described step 6), Entitlement Control Message receives process of analysis and is:
S301: digital TV terminal receives Entitlement Control Message;
S302: resolve Entitlement Control Message, judge whether there is Entitlement Control Message descriptor in Entitlement Control Message, if exist, performs step S303; If do not exist, perform step S301;
S303: judge whether there is the CA system identifier identifier consistent with digital TV terminal CA system identifier identifier in Entitlement Control Message, if exist, performs step S304; If do not exist, perform step S301;
S304: resolve the data that in Entitlement Control Message, digital TV terminal CA system identifier identifier is corresponding, obtain control word, complete parsing.
In described step 6), Entitlement Management Message receives process of analysis and is:
S401: digital TV terminal starts the action of reception Entitlement Management Message;
S402: the ID identifier according to the CA system of digital TV terminal arranges filter F ilter;
S403: judge whether to receive Entitlement Management Message data, if receive, then performs step S404; If do not receive, perform step S401;
S404: resolve Entitlement Management Message.
The invention has the beneficial effects as follows: the present invention adds CA public server between scrambling machine and each CA server, the control word that CA public server reception scrambling machine is sent also sends to each CA server, simultaneously, CA public server receives the Entitlement Control Message and Entitlement Management Message that each CA server sends, scrambling machine is issued again to the new Entitlement Control Message of generation and Entitlement Management Message after its process, for scrambling machine, CA public server can be regarded as a CA server, scrambling machine need not be concerned about the quantity with close CA system, solve cause because scrambling machine interface is limited can with the limited amount problem of close CA system, meanwhile, when increasing or change with close CA system, without the need to changing to scrambling machine with close setting and again debugging, can not go wrong with close CA system because increasing or changing, increase or change simple and convenient with close CA system, being easy to realize.In addition, the present invention carries out treatment combination by CA public server to the ECM data sent with close CA system, can reduce the bandwidth taken with close ECM data, reduces owing to increasing with close CA system, ECM data increase impact on program stream.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present invention;
Fig. 2 is Entitlement Control Message product process figure of the present invention;
Fig. 3 is Entitlement Management Message product process figure of the present invention;
Fig. 4 is that Entitlement Control Message of the present invention receives process of analysis figure;
Fig. 5 is that Entitlement Management Message of the present invention receives process of analysis figure;
Fig. 6 is the Entitlement Control Message structural representation that CA public server of the present invention generates;
Fig. 7 is the Entitlement Management Message structural representation that CA public server of the present invention generates.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and illustrated embodiment of the present invention and explanation thereof, for explaining the present invention, do not form inappropriate limitation of the present invention.
As shown in Figure 1, a kind of many CA are with close system, and it comprises:
CA public server, some CA servers, scrambling machine and some digital TV terminals, wherein:
CA server and the two-way communication of CA public server; CA public server and the two-way communication of scrambling machine; Scrambling machine and digital TV terminal one-way communication.
Described CA public server receives the control word from scrambling machine, and control word is sent to connected CA server; Meanwhile, CA public server processes the Entitlement Control Message from CA server received and Entitlement Management Message, generates new Entitlement Control Message and Entitlement Management Message, and new Entitlement Control Message and Entitlement Management Message are sent to scrambling machine.
As shown in Figure 2, many CA with Entitlement Control Message product process in decryption method are:
S101: scrambling machine generates Control Word, Control Word is sent to CA public server, and utilizes Control Word to carry out scrambling to transfer of data stream;
Control Word is sent to connected each CA server by S102:CA public server, and each CA server is labeled as CA successively 1..., CA n;
S103: each CA server CA 1..., CA nentitlement Control Message ECM is generated respectively according to Control Word 1..., ECM n, and send to CA public server;
S104:CA public server is at each Entitlement Control Message ECM 1..., ECM nthe front Entitlement Control Message descriptor increasing correspondence respectively, and each Entitlement Control Message combination after Entitlement Control Message descriptor will be added, generate new Entitlement Control Message ECM and send to scrambling machine; Described Entitlement Control Message descriptor at least comprises the ID identifier of the CA system generating this Entitlement Control Message;
S105: the Entitlement Control Message ECM received is sent to digital TV terminal by scrambling machine together with the data transmission stream after scrambling.
Described n be greater than 1 natural number.
As shown in Figure 3, many CA with Entitlement Management Message product process in decryption method are:
S201: each CA server CA 1..., CA ngenerate Entitlement Management Message EMM respectively 1..., EMM nand send to CA public server;
S202:CA public server is at each Entitlement Management Message EMM 1..., EMM nthe front Entitlement Management Message descriptor increasing correspondence, and will each Entitlement Management Message of Entitlement Management Message descriptor be added as new Entitlement Management Message EMM 1' ..., EMM n' send to scrambling machine; Described Entitlement Management Message descriptor at least comprises the ID identifier of the CA system generating this Entitlement Management Message;
S203: each Entitlement Management Message EMM that scrambling machine will receive 1' ..., EMM n' digital TV terminal is sent to together with the data transmission stream after scrambling;
As shown in Figure 4, many CA with Entitlement Control Message reception process of analysis in decryption method are:
S301: digital TV terminal receives Entitlement Control Message ECM;
S302: resolve Entitlement Control Message ECM, judge whether there is Entitlement Control Message descriptor in Entitlement Control Message ECM, if exist, performs step S303; If do not exist, perform step S301;
S303: judge whether there is the CA system identifier identifier consistent with digital TV terminal CA system identifier identifier in Entitlement Control Message, if exist, performs step S304; If do not exist, perform step S301;
S304: resolve the data that in Entitlement Control Message ECM, digital TV terminal CA system identifier identifier is corresponding, obtain Control Word;
S305: utilize Control Word to carry out descrambling to scrambled data, plays scrambled program;
As shown in Figure 5, many CA with Entitlement Management Message reception process of analysis in decryption method are:
S401: digital TV terminal starts the action of reception Entitlement Management Message;
S402: the ID identifier according to the CA system of digital TV terminal arranges filter F ilter;
S403: judge whether to receive Entitlement Management Message data, if receive, then illustrates that this Entitlement Management Message is corresponding with digital TV terminal CA system identifier identifier, performs step S404; Otherwise, perform step S401;
S404: resolve Entitlement Management Message.
As shown in Figure 6, the Entitlement Control Message form that CA public server generates is that it comprises fields successively: Table ID, ECM Data Length, CAS 1-ID, ECM 1length, ECM 1..., CAS n-ID, ECM nlength, ECM n, CRC, wherein,
CAS 1-ID ..., CAS n-ID is respectively each CA server CA 1..., CA nthe ID identifier of the CA system run;
ECM 1length ..., ECM nlength is respectively each Entitlement Control Message ECM 1..., ECM nlength;
N be greater than 1 natural number.
As shown in Figure 7, the Entitlement Management Message form that CA public server generates is that it comprises fields successively: EMM xtableID, EMM xdata Length, CAS x-ID, EMM xdata, CRC, wherein,
CAS x-ID is CA server CA xthe ID identifier of the CA system run;
EMM xdata is Entitlement Management Message EMM xremove the data after Table ID and Length;
EMM xdata Length is ID identifier, CRC and EMM of CA system xthe length sum of Data;
X is 1 ..., n; N be greater than 1 natural number.
Above-mentioned is preferred embodiment of the present invention, and on the basis of technical scheme of the present invention, the various amendment made or distortion still belong to protection scope of the present invention.

Claims (6)

1. CA more than, with a close system, is characterized in that, it comprises: CA public server, some CA servers, scrambling machine and some digital TV terminals, wherein:
CA server and the two-way communication of CA public server; CA public server and the two-way communication of scrambling machine; Scrambling machine and digital TV terminal one-way communication;
CA public server receives the control word from scrambling machine, and control word is sent to connected CA server;
Meanwhile, CA public server processes the Entitlement Control Message from CA server received and Entitlement Management Message, generates new Entitlement Control Message and Entitlement Management Message, and new Entitlement Control Message and Entitlement Management Message are sent to scrambling machine;
The Entitlement Control Message received and Entitlement Management Message are then sent to digital TV terminal by scrambling machine.
2. adopt many CA according to claim 1 with a same decryption method for close system, it is characterized in that, its step is:
1) scrambling machine generates control word, and control word is sent into CA public server, control word is sent to connected each CA server by CA public server;
2) each CA server generates Entitlement Control Message respectively according to control word and sends to CA public server; Meanwhile, each CA server also generates Entitlement Management Message and sends to CA public server;
3) CA public server increases corresponding Entitlement Control Message descriptor respectively before each Entitlement Control Message, and will add each Entitlement Control Message combination after Entitlement Control Message descriptor, generates new Entitlement Control Message;
CA public server still increases corresponding Entitlement Management Message descriptor before each Entitlement Management Message simultaneously, and will add each Entitlement Management Message after Entitlement Management Message descriptor as new Entitlement Management Message;
4) new Entitlement Control Message and new Entitlement Management Message are sent to scrambling machine by CA public server;
5) the new Entitlement Control Message received and new Entitlement Management Message are sent to digital TV terminal by scrambling machine;
6) digital TV terminal receives new Entitlement Control Message and new Entitlement Management Message and resolves, and completes the condition reception of program.
3. same decryption method as claimed in claim 2, is characterized in that, in described step 3), described Entitlement Control Message descriptor at least comprises the ID identifier of the CA system generating this Entitlement Control Message.
4. same decryption method as claimed in claim 2, is characterized in that, in described step 3), described Entitlement Management Message descriptor at least comprises the ID identifier of the CA system generating this Entitlement Management Message.
5. same decryption method as claimed in claim 2, is characterized in that, in described step 6), Entitlement Control Message receives process of analysis and is:
S301: digital TV terminal receives Entitlement Control Message;
S302: resolve Entitlement Control Message, judge whether there is Entitlement Control Message descriptor in Entitlement Control Message, if exist, performs step S303; If do not exist, perform step S301;
S303: judge whether there is the CA system identifier identifier consistent with digital TV terminal CA system identifier identifier in Entitlement Control Message, if exist, performs step S304; If do not exist, perform step S301;
S304: resolve the data that in Entitlement Control Message, digital TV terminal CA system identifier identifier is corresponding, obtain control word, complete parsing.
6. same decryption method as claimed in claim 2, is characterized in that, in described step 6), Entitlement Management Message receives process of analysis and is:
S401: digital TV terminal starts the action of reception Entitlement Management Message;
S402: the ID identifier according to the CA system of digital TV terminal arranges filter F ilter;
S403: judge whether to receive Entitlement Management Message data, if receive, then performs step S404; If do not receive, perform step S401;
S404: resolve Entitlement Management Message, obtain the authorization message of digital TV terminal.
CN201210269752.9A 2012-07-30 2012-07-30 Multiple-CA (conditional access) simulcrypt system and method Active CN102761777B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201210269752.9A CN102761777B (en) 2012-07-30 2012-07-30 Multiple-CA (conditional access) simulcrypt system and method
PCT/CN2013/000872 WO2014019336A1 (en) 2012-07-30 2013-07-22 Multi-ca simulcrypt system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210269752.9A CN102761777B (en) 2012-07-30 2012-07-30 Multiple-CA (conditional access) simulcrypt system and method

Publications (2)

Publication Number Publication Date
CN102761777A CN102761777A (en) 2012-10-31
CN102761777B true CN102761777B (en) 2015-07-15

Family

ID=47056073

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210269752.9A Active CN102761777B (en) 2012-07-30 2012-07-30 Multiple-CA (conditional access) simulcrypt system and method

Country Status (2)

Country Link
CN (1) CN102761777B (en)
WO (1) WO2014019336A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102761777B (en) * 2012-07-30 2015-07-15 山东泰信电子股份有限公司 Multiple-CA (conditional access) simulcrypt system and method
CN106851391A (en) * 2015-12-03 2017-06-13 国家新闻出版广电总局广播科学研究院 A kind of condition receiving method and system for intelligent operating system
CN107749999B (en) * 2017-09-28 2019-10-22 高斯贝尔数码科技股份有限公司 A kind of digital television conditional access system inside parallel method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1620137A (en) * 2003-11-21 2005-05-25 华为技术有限公司 Authorization system and method
CN101431655A (en) * 2008-12-09 2009-05-13 四川长虹电器股份有限公司 Method for implementing zone control of digital television
CN101662649A (en) * 2009-09-15 2010-03-03 四川长虹电器股份有限公司 Subscriber entitlement method used in conditional access system of digital TV
CN201733394U (en) * 2010-07-22 2011-02-02 山东泰信电子有限公司 Digital information safety processing system
CN102523484A (en) * 2011-12-27 2012-06-27 山东泰信电子有限公司 System and method for scrambling digital television data

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060294547A1 (en) * 2003-09-05 2006-12-28 Bon Bjorn J M System and method for forced commercial viewing
CN101674453B (en) * 2008-09-09 2011-09-07 北京视博数字电视科技有限公司 Program information processing method, safety device and receiving terminal
CN102387407A (en) * 2010-08-31 2012-03-21 国基电子（上海）有限公司 System and method for realizing broadcasting network conditional access (CA)
CN102761777B (en) * 2012-07-30 2015-07-15 山东泰信电子股份有限公司 Multiple-CA (conditional access) simulcrypt system and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1620137A (en) * 2003-11-21 2005-05-25 华为技术有限公司 Authorization system and method
CN101431655A (en) * 2008-12-09 2009-05-13 四川长虹电器股份有限公司 Method for implementing zone control of digital television
CN101662649A (en) * 2009-09-15 2010-03-03 四川长虹电器股份有限公司 Subscriber entitlement method used in conditional access system of digital TV
CN201733394U (en) * 2010-07-22 2011-02-02 山东泰信电子有限公司 Digital information safety processing system
CN102523484A (en) * 2011-12-27 2012-06-27 山东泰信电子有限公司 System and method for scrambling digital television data

Also Published As

Publication number Publication date
CN102761777A (en) 2012-10-31
WO2014019336A1 (en) 2014-02-06

Similar Documents

Publication Publication Date Title
CN100525434C (en) Method for granting power to user in receiving system under digital TV condition
CN1153447C (en) Packet filtering
CN104902311B (en) A kind of shared method of audio and video resources, shared gateway and system
CN102957961B (en) Share the method for encrypted digital television program, device and digital television receiver
JP2001527350A (en) Scramble unit for digital transmission system
CN105247811A (en) Methods, information providing system, and reception apparatus for protecting content
EP2373019A1 (en) Secure descrambling of an audio / video data stream
CN105657501B (en) A kind of digital TV direct system and method
CN101355640A (en) Multi-display digital television set-top box
US20080165962A1 (en) Multistream distributor and multi-descrambler
US10779052B2 (en) Receiving apparatus, receiving method, transmitting apparatus, and transmitting method
CN103024476B (en) DTV gateway equipment and the method for content safety protection
CN101494762A (en) Method for displaying digital television program based on user property
CN104918122A (en) A method and device for sharing and controlling a plurality of devices in a home network
CN104869437A (en) Digital television conditional access-based bidirectional terminal barrage realizing method
CN108156486A (en) Sharing method and device, home media equipment is broadcast live
CN106658151A (en) Method and device for rapidly changing station of digital television
CN102761777B (en) Multiple-CA (conditional access) simulcrypt system and method
CN2859956Y (en) Set up box
CN102404613A (en) System and method for realizing program-requesting function of one-way set top box
CN102970251A (en) Networking method and networking device
CN201298872Y (en) Multi-display digital TV set-top box
CN202799014U (en) Multiplex system of multi-path transport stream (TS) code stream
KR20100078352A (en) A method for digital broadcasting service and a system thereof
CN101094384A (en) Method for restricting number of channel watched by user at same time

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant