CN100546365C - The copy protection method of digital cable broadcast channel, CableCARD module and video system - Google Patents
The copy protection method of digital cable broadcast channel, CableCARD module and video system Download PDFInfo
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- CN100546365C CN100546365C CNB2006100755859A CN200610075585A CN100546365C CN 100546365 C CN100546365 C CN 100546365C CN B2006100755859 A CNB2006100755859 A CN B2006100755859A CN 200610075585 A CN200610075585 A CN 200610075585A CN 100546365 C CN100546365 C CN 100546365C
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- digital cable
- broadcast channel
- cable broadcast
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- 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
- H04N21/43—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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4383—Accessing a communication channel
-
- 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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91328—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
Abstract
A kind of copy protection method of the digital cable broadcast channel according to predetermined digital cable broadcast standard is provided, and described method comprises: channel is changed to the first digital cable broadcast channel; And between CableCARD module and the video equipment corresponding with the channel change operations of the first digital cable broadcast channel copy protection value of exchange digital cable broadcast standard, and do not consider at least one previous channel with respect to the described first digital cable broadcast channel.
Description
Technical field
Apparatus and method according to the invention relate to according to the copy protection method of predetermined digital cable broadcast standard, CableCARD (ply-yarn drill is arranged) module and video system; relate in particular to such copy protection method, CableCARD module and video system; that is, the copy protection value of digital cable broadcast standard that prevents to be used for the content of same numbers wired broadcasting channel in channel change operations is not exchanged.
Background technology
Recently, use Digital Terrestrial Television Broadcast and digital satellite broadcasting to increase apace in the whole world as broadcast medium.
The digital cable broadcast standard comprises: in the U.S., Korea S and other local OpenCable that uses (open cable) standards, digital cable video broadcasting (the DVB-C that uses in Europe, Digital VideoBroadcast-Cable) standard, and wired integrated service digits broadcasting (ISDB-C, Integrated Service Digital Broadcasting-Cable) standard of using in Japan.
In these standards, the OpenCable standard is based on motion image expert group 2 (MPEG-2) and wire cable data, services interface specification (DOCSIS, Data Over Cable Service InterfaceSpecifications), this standard is used as the transmission standard of wire line MODEM.The OpenCable standard is the set that is used for the interface standard of digital device, for example according to set-top box and the Digital Television made by the OpenCable standard of cable television laboratory (CableTelevision Laboratories Inc) definition.
The OpenCable standard code condition of separating insert part and receiving equipment (that is, television set, the pre-box of machine).Therefore, in order to satisfy FCC (Federal Communications Commission) (FCC, Federal CommunicationCommission) to the regulation of OpenCable standard, set-top box comprises that the video equipment (main frame) of unconditional access part and the condition that comprises insert partial C ableCARD module.
After this, will be described in the copy-protection system of coupling copy protection value between video equipment in the OpenCable standard and the CableCARD module below.The OpenCable standard is embodied as two types copy preventing system.
A kind of copy preventing system is the conditional access system (CAS that is used for the digital cable broadcast compartment system; Conditional Access System); another kind is the copy-protection system (CPS that works between CableCARD module and video equipment; Copy Protection System), described CableCARD module is separated with video equipment (main frame).Usually, copy preventing system refers to CPS.
Existing digital broadcasting receiving apparatus system has such function: in described function, content encoded is received from compartment system, and encoded content is optionally reverted to general vision signal (that is embedded conditional access system) in receiving equipment inside.The CableCARD module is as the security module work that the condition access function is separated with receiving equipment.
In CPS, the coded digital content that sends from compartment system is at the CableCARD module as user receiving equipment decoded (that is, the deciphering of CA payload), thereby digital content is converted into the form of decoding.Subsequently, described digital content is encoded (that is, CP encrypts) according to the CPS standard once more by the CableCARD module, and the content that is encoded then is sent to video equipment and reproduces.Utilize this encoding scheme, CPS has limited the use that sends to the content of video equipment from the CableCARD module.
According to the type of the content that receives, CPS provides the copy protection of different levels.For example, can the common channel that receives not limited, and the additional payment channel can comprise the restriction to the copy broadcast content.
The coding application standard that is used for copy protection is given contents producer, and contents producer provides suitable content.Determine whether to allow the information of CPS to be called as copy control information (CCI, Copy ControlInformation) value, and the CCI value of the CableCARD module of the receiver digital content correspondence that receives and be transmitted.Here, compartment system utilizes the privately owned partial data in the mpeg 2 transport stream to transmit the message that indicates whether to allow receiver reproduction additional payment digital content.
Therefore, whether video equipment and CableCARD module can be replicated based on the video equipment that the CCI value exchanges the digital content of controlling the reception specific broadcast channel.
Fig. 1 shows according to the encryption mode indicator of the CCI value of OpenCable standard (EMI, Encryption Mode Indicator).As shown, content with " 00 " CCI value is unrestricted in the quantity that can duplicate, content with " 01 " CCI value is two or more times with copy limit, for only once, and restriction is carried out any duplicating to the content with " 11 " CCI value to content with " 10 " CCI value with copy limit.
Fig. 2 shows the process of exchange CCI value between according to the video equipment of OpenCable standard and CableCARD module.
At operation S20, the video equipment receiving channels changes request, and channel is changed then.Then, at operation S21, video equipment is determined and channel changes whether the corresponding channel of request is broadcast channel.At operation S26, not under the situation of broadcast channel at requested channel, that is, be changed at channel under the situation of analog broadcast channel, channel change operations finishes and does not have the CCI value to exchange.
Simultaneously, be changed at channel under the situation of broadcast channel, at operation S22, the CableCARD module arrives video equipment with the Request_CCI_Exchange transmission of messages.At operation S23, receive the video equipment response Request_CCI_Exchange message of Request_CCI_Exchange message, Request_CCI_N_host message transmission of messages is arrived the CableCARD module.
At operation S24, receiving from video equipment under the situation of Reques_ CCI_N_host message, the CableCARD module will authenticate (Authentication) CCI transmission of messages to video equipment, and at operation S25, video equipment is determined the CCI value according to the authentication CCI message that is received.Therefore, at operation S26, channel change operations is finished.So whether the content that video equipment is controlled selecteed broadcast channel according to determined CCI value can be replicated.
Here, to do not receive the situation of the CCI value of suitable broadcast channel in the process that changes to broadcast channel at video equipment owing to any reason video equipment, the CCI value of OpenCable standard instruction video equipment broadcast channel is set to " 11 " value.That is the content that does not allow to duplicate this broadcast channel if video equipment does not receive the CCI value.
Disclose and the various technical characterictics relevant according to the copy protection of OpenCable standard.For example, in No.2004-7494 number first openly Japan Patent, disclose and duplicated (conditional copy free), and in the No.2001-5150 PCT world is open, disclose the coding of adequate information in the exchange of CCI value and the reception and the transmission of coded message with respect to the condition free that freely duplicates.
But, in the OpenCable standard environment, channel is changed to broadcast channel and watching under the situation of analog broadcast channel simultaneously from analog broadcast channel the user, exist CCI value to exchange situation about not being done at broadcast channel.Specifically, the user channel is changed to analog broadcast channel and watches broadcast channel simultaneously, and the user returns channel switch under the situation of previous broadcast channel, make a mistake, this is not to be done because CCI value exchanges.
Therefore, the content of duplicating channel may be subjected to limiting irrelevantly, and exchange does not take place because the channel change operations from the analog channel to the digital channel causes the CCI value.
In addition, the user may think that the content of duplicating broadcast channel should be allowed to, and may therefore think it is the copy error of video equipment or CableCARD module by mistake.
Summary of the invention
Therefore, one aspect of the present invention provides a kind of copy protection method, CableCARD module and video system, and it prevents from channel changes not exchanged at the copy protection value of the cabled digital broadcast standard of the content of same numbers wired broadcasting channel.
By the copy protection method according to the digital cable broadcast channel of predetermined digital cable broadcast standard is provided, can realize aforementioned and/or other aspects of the present invention, described method comprises: select the first digital cable broadcast channel; And; the copy protection value of the predetermined digital cable broadcast standard of exchange between CableCARD module and the video equipment corresponding with the described first digital cable broadcast channel, the described first digital cable broadcast channel is independent of at least one previous channel of selecting and selects before the described first digital cable broadcast channel.
According to an aspect of the present invention, predetermined digital cable broadcast standard can comprise the OpenCable standard; And the copy protection value comprises according to the copy control information of OpenCable standard (CCI) value.
According to an aspect of the present invention, at least one previous channel can be included in the analog broadcast channel of selecting before the described first digital cable broadcast channel; And the second digital cable broadcast channel of before described analog broadcast channel, selecting.
According to an aspect of the present invention, the digital content of the digital content of the described first digital cable broadcast channel and the described second digital cable broadcast channel is identical, and described first broadcast channel is identical with described second broadcast channel.
According to an aspect of the present invention, the copy protection value of exchange digital cable broadcast standard can comprise between CableCARD module and video equipment: Request_CCI_Exchange message is sent to video equipment from the CableCARD module, and it is corresponding with the first digital cable broadcast channel channel change operations; Request_CCI_N_host message is sent to the CableCARD module from described video equipment, and device is with corresponding from the Request_CCI_Exchange message of CableCARD module transmission; And response Request_CCI_N_host message, will authenticate CCI message and send to described video equipment from described CableCARD module.
CableCARD module by the predetermined digital cable broadcast standard that provides support can realize aforementioned and/or other aspects of the present invention, described CableCARD module comprises: the CableCARD interface section, and it carries out communication by CableCARD interface protocol and video equipment; With; controller; it is by described CableCARD interface section; be independent of at least one previous channel of before described digital cable broadcast channel, selecting and and described video equipment exchange the copy protection value of described predetermined digital cable broadcast standard; wherein, receive described digital cable broadcast channel by described CableCARD interface section from described video equipment.
According to an aspect of the present invention, described predetermined digital cable broadcast standard can comprise the 0penCable standard, and the copy protection value comprises copy control information (CCI) value according to the OpenCable standard.
According to an aspect of the present invention, described at least one previous channel is included in the analog broadcast channel of selecting before the described first digital cable broadcast channel, and the second digital cable broadcast channel that received before described analog broadcast channel.
According to an aspect of the present invention, the digital content of the digital content of the described first digital cable broadcast channel and the described second digital cable broadcast channel is identical, and described first broadcast channel is identical with described second broadcast channel.
Video system by the predetermined digital cable broadcast standard that provides support can realize aforementioned and/or other aspects of the present invention, and described video system comprises: video equipment; And CableCARD module; its be independent of at least one previous channel of before the digital cable broadcast channel, selecting and and described video equipment exchange the copy protection value of described predetermined digital cable broadcast standard; wherein, receive described digital cable broadcast channel according to described predetermined digital cable broadcast standard from described video equipment.
According to an aspect of the present invention, described digital cable broadcast standard can comprise the OpenCable standard; And the copy protection value comprises copy control information (CCI) value according to the OpenCable standard.
According to an aspect of the present invention, described at least one previous channel is included in analog broadcast channel of selecting before the described first digital cable broadcast channel and the second digital cable broadcast channel of selecting before described analog broadcast channel.
According to an aspect of the present invention, the digital content of the digital content of described first broadcast channel and the described second digital cable broadcast channel is identical, and described first broadcast channel is identical with described second broadcast channel.
Description of drawings
In conjunction with the accompanying drawings, from following description to one exemplary embodiment, above-mentioned and/or other aspects of the present invention will become clear and be more readily understood, in the accompanying drawings:
Fig. 1 shows the encryption mode indicator (EMI) according to the CCI value of OpenCable standard;
Fig. 2 shows the exchange process of CCI value between video equipment and CableCARD module in the OpenCable standard;
Fig. 3 is the control block diagram of the video equipment of one exemplary embodiment according to the invention;
Fig. 4 shows the copy protection method according to one exemplary embodiment of the present invention; With
Fig. 5 shows simulation protection system (APS) value in the CCI value of supporting in the OpenCable standard.
Embodiment
Now will be in detail with reference to one exemplary embodiment of the present invention, its example is shown in the drawings, and wherein identical Reference numeral is indicated components identical all the time.One exemplary embodiment is described below, so that by the present invention is described with reference to the accompanying drawings.
With reference to figure 3, comprise CableCARD module 10 and video equipment 20 according to the video system of one exemplary embodiment of the present invention.CableCARD module 10 and video equipment 20 provide predetermined digital cable broadcast standard.Determine restriction to the content of duplicating broadcast channel according to the exchange of copy protection value in video equipment 20, described copy protection value is limited by suitable digital cable broadcast standard.
Here, be the OpenCable standard according to the digital cable broadcast standard of one exemplary embodiment of the present invention, and, the CCI value that described copy protection value is the OpenCable standard.
Video equipment 20 determines whether to reproduce broadcast channel by CableCARD module 10.Here, video equipment 20 optionally reproduces broadcast channel and analog video channel.In addition, in video equipment 20 according to one exemplary embodiment of the present invention, determine the reproduction of broadcast channel by CableCARD module 10, and, video equipment 20 can be applied to OpenCable set-top box or wired ready (cable-ready) Digital Television, and they can be the types of using in unidirectional or two-way wired distributed network.
Video equipment 20 comprises communicator 22; be used for from CableCARD module 10 receiving digital broadcast signals, analog broadcast signal and other signals; and the signal that receives sent to device controller 21; be used to handle the broadcasting channel that receives by communicator 22, and and CableCARD module 10 exchange CCI values so that provide copy protection for the content of this broadcasting channel.
CableCARD module 10 comprises CableCARD interface section 12 and module controller 11, but wired interface section 12 is connected to the communicator 22 of video equipment 20, and use the CableCARD interface protocol to carry out communication, module controller 11 is by CableCARD interface section 12 and video equipment 20 exchange CCI values.
Here, receiving from video equipment 20 under the situation of digital cable broadcast channel by CableCARD interface section 12, module controller 11 is independent of at least one or more a plurality of previous channel type and video equipment 20 and exchanges the CCI values.That is, the digital cable broadcast channel is changed by video equipment 20, and irrelevant with the type of current channel or previous current channel, CableCARD module 10 constantly with video equipment 20 exchange CCI values.
Therefore, CableCARD module 10 prevents from not exchanged at the CCI value of the content of digital cable broadcast channel.
After this, will be with reference to the copy protection method of figure 4 descriptions according to the digital cable broadcast channel of OpenCable standard.
As an example following situation will be described: in turn from the second digital cable broadcast channel to analog broadcast channel and from analog broadcast channel during channel change operations to the first digital cable broadcast channel, do not exchange the CCI value between CableCARD module 10 and the video equipment 20, and the second digital cable broadcast channel is identical channel with the first digital cable broadcast channel, and receive identical digital content (that is, identical program number).
At first, at operation S40, video equipment is selected second digital broadcast signal.Then, at operation S40a, when the user just watched the second digital cable broadcast channel by video equipment 20, video equipment 20 received the change channel signals that second digital broadcast signal is changed to the analog broadcast channel signal.Then, at operation S40b, the device controller 21 of video equipment 20 changes to the analog broadcast channel that spectators ask with current channel (that is second broadcast channel).
At operation S41, when the user just watched analog broadcast channel by video equipment 20, video equipment 20 received the change channel signals that analog broadcast signal is changed to first digital broadcast signal.Change channel signals among the operation response S41, the device controller 21 of video equipment 20 changes to first broadcast channel with channel.
Here, the second digital cable broadcast channel is identical channel with the first digital cable broadcast channel, and identical digital content (that is, identical program number) is broadcasted.
At this moment, the module controller 11 of CableCARD module 10 and video equipment 20 exchange CCI values, it receives first broadcast channel by following process.
At first, module controller 11 arrives video equipment 20 by CableCARD interface section 12 with the Request_CCI_Exchange transmission of messages.Then, device controller 21 responses of video equipment 20 are arrived CableCARS module 10 by communicator 22 with the Request_CCI_N_host transmission of messages from the Request_CCI_Exchange of CableCARD module 10.
Then, the Request_CCI_N_host message that module controller 11 responses of CableCARD module 10 receive from video equipment 20 by CableCARD interface section 12, to authenticate CCI message and be transferred to video equipment 20 by CableCARD interface section 12, authentication CCI message comprises the CCI value of the first digital cable broadcast channel.
Subsequently, authentication CCI message is received by communicator 22, and the device controller 21 of video equipment 20 is confirmed the program number and the CCI value of the digital content of the first digital cable broadcast channel.Then, video equipment 20 will authenticate CCI affirmation (Authentication CCIAcknowledgement) message by communicator 22 and be sent to CableCARD module 10.
Therefore, at operation S43, video equipment 20 and CableCARD module 10 are finished channel are changed to the first digital cable broadcast channel, and video equipment 20 is determined the copy limit of the digital content of the first digital cable broadcast channel according to the CCI value of the first digital cable broadcast channel.
Can comprise encryption mode indicator (EMI) value and/or simulation protection system (APS) value according to the CCI value in the video system of one exemplary embodiment of the present invention.The EMI value can be one of them of the OpenCable standard EMI value shown in Fig. 1.In addition, can limit like that as shown in Figure 5 with the relevant APS value of copy protection of the content of analog broadcast channel.In an exemplary embodiment, copy-protection system (CPS) the standard correspondence of APS value and OpenCable standard.
Although illustrated and described several one exemplary embodiment of the present invention, but those of skill in the art will understand, just can make change in these one exemplary embodiment without departing from the spirit and scope of the present invention, scope definition of the present invention is in claims and equivalent thereof.
Claims (13)
1. a kind of copy protection method according to the digital cable broadcast channel of predetermined digital cable broadcast standard, described method comprises:
Select the first digital cable broadcast channel; And
Be independent of the previous channel type that at least one was selected before described digital cable broadcast channel, the copy protection value of the described predetermined digital cable broadcast standard of exchange between CableCARD module and the video equipment corresponding with the described first digital cable broadcast channel.
2. copy protection method as claimed in claim 1, wherein, described predetermined digital cable broadcast standard comprises the OpenCable standard; And
Described copy protection value comprises copy control information (CCI) value according to the OpenCable standard.
3. copy protection method as claimed in claim 2; wherein; described at least one previous channel is included in the analog broadcast channel of selecting before the described first digital cable broadcast channel, and the second digital cable broadcast channel of selecting before described analog broadcast channel.
4. copy protection method as claimed in claim 3; wherein; the digital content of the digital content of the described first digital cable broadcast channel and the described second digital cable broadcast channel is identical, and the described first digital cable broadcast channel is identical with the described second digital cable broadcast channel.
5. copy protection method as claimed in claim 4, wherein, the copy protection value of the described digital cable broadcast standard of exchange also comprises between described CableCARD module and described video equipment:
Request_CCI_Exchange message is sent to described video equipment from described CableCARD module, and its channel change operations with the described first digital cable broadcast channel is corresponding;
Request_CCI_N_host message is sent to the CableCARD module from described video equipment, and it is with corresponding from the Request_CCI_Exchange message of CableCARD module transmission; With
Respond described Request_CCI_N_host message, will authenticate CCI message and send to described video equipment from the CableCARD module.
6. CableCARD module of supporting predetermined digital cable broadcast standard, this CableCARD module comprises:
The CableCARD interface section, it carries out communication by CableCARD interface protocol and video equipment; With
Controller; it is by described CableCARD interface section; be independent of at least one previous channel type of before the digital cable broadcast channel, selecting and and described video equipment exchange the copy protection value of described predetermined digital cable broadcast standard; wherein, receive described digital cable broadcast channel by described CableCARD interface section from described video equipment.
7. CableCARD module as claimed in claim 6, wherein, described predetermined digital cable broadcast standard comprises the OpenCable standard; And
Described copy protection value comprises copy control information (CCI) value according to the OpenCable standard.
8. CableCARD module as claimed in claim 7, wherein, described at least one previous channel is included in the analog broadcast channel of selecting before the first digital cable broadcast channel, and the second digital cable broadcast channel of selecting before described analog broadcast channel.
9. CableCARD module as claimed in claim 8, wherein, the digital content of the digital content of the described first digital cable broadcast channel and the described second digital cable broadcast channel is identical, and the described first digital cable broadcast channel is identical with the described second digital cable broadcast channel.
10. video system of supporting predetermined digital cable broadcast standard, described video system comprises:
Video equipment; And
The CableCARD module; its be independent of at least one previous channel type of before the digital cable broadcast channel, selecting and and described video equipment exchange the copy protection value of described predetermined digital cable broadcast standard; wherein, receive described digital cable broadcast channel according to described predetermined digital cable broadcast standard from described video equipment.
11. video system as claimed in claim 10, wherein, described predetermined digital cable broadcast standard comprises the OpenCable standard; And
Described copy protection value comprises copy control information (CCI) value according to the OpenCable standard.
12. video system as claimed in claim 11, wherein, described at least one previous channel is included in the analog broadcast channel of selecting before the first digital cable broadcast channel, and the second digital cable broadcast channel of selecting before described analog broadcast channel.
13. video system as claimed in claim 12, wherein, the digital content of the digital content of the described first digital cable broadcast channel and the described second digital cable broadcast channel is identical, and the described first digital cable broadcast channel is identical with the described second digital cable broadcast channel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR33809/05 | 2005-04-23 | ||
| KR20050033809 | 2005-04-23 |
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| Publication Number | Publication Date |
|---|---|
| CN1852408A CN1852408A (en) | 2006-10-25 |
| CN100546365C true CN100546365C (en) | 2009-09-30 |
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| CNB2006100755859A Expired - Fee Related CN100546365C (en) | 2005-04-23 | 2006-04-19 | The copy protection method of digital cable broadcast channel, CableCARD module and video system |
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| KR (1) | KR100688984B1 (en) |
| CN (1) | CN100546365C (en) |
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| KR100351817B1 (en) * | 2000-01-13 | 2002-09-11 | 엘지전자 주식회사 | open-cable receive system and method for diagnosing of open-cable receive system |
| KR100431362B1 (en) * | 2002-07-03 | 2004-05-13 | 전자부품연구원 | Wireless network system for receiving digital television broadcasting |
| KR20050048052A (en) * | 2003-11-18 | 2005-05-24 | 삼성전자주식회사 | Method and apparatus for management of broadcasting signal |
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| KR100688984B1 (en) | 2007-03-08 |
| KR20060111344A (en) | 2006-10-27 |
| CN1852408A (en) | 2006-10-25 |
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