WO2009075535A2 - Prepaid broadcasting receiver and subscriber management system and method thereof in digital multimedia broadcasting service - Google Patents

Prepaid broadcasting receiver and subscriber management system and method thereof in digital multimedia broadcasting service Download PDF

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Publication number
WO2009075535A2
WO2009075535A2 PCT/KR2008/007340 KR2008007340W WO2009075535A2 WO 2009075535 A2 WO2009075535 A2 WO 2009075535A2 KR 2008007340 W KR2008007340 W KR 2008007340W WO 2009075535 A2 WO2009075535 A2 WO 2009075535A2
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WO
WIPO (PCT)
Prior art keywords
subscription
information
storage unit
prepaid
service
Prior art date
Application number
PCT/KR2008/007340
Other languages
French (fr)
Other versions
WO2009075535A3 (en
Inventor
Ju Young Choi
Heon Ju Park
Min Suk Guahk
Original Assignee
Tu Media 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 Tu Media Corp. filed Critical Tu Media Corp.
Publication of WO2009075535A2 publication Critical patent/WO2009075535A2/en
Publication of WO2009075535A3 publication Critical patent/WO2009075535A3/en

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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]
    • H04N21/60—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2543—Billing, e.g. for subscription services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—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
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]

Definitions

  • the present invention relates to a method, system and CAS-based digital broadcasting receiver for rapidly processing EMMs (Entitlement Management Messages) needed for an initial broadcast reception in a receiver of a subscriber who is newly registered in a Condition Access System for digital broadcasting, without using a frequency band for broadcasting.
  • EMMs Entitlement Management Messages
  • CAS CAS
  • confidentiality, integrity, availability, accountability, authenticity and reliability in order to protect broadcast contents.
  • Packet information for the CAS is usually transferred through a Transport Layer, for example MPEG2 TS (Transport Stream), in which an EMM carrying personal information, view entitlement and modifier keys for a service program is transferred through a TS packet of 188 bytes if a subscriber is newly registered or changed, and an ECM (Entitlement Control Message) carrying event access and decoding information is periodically transferred through a TS packet of 188 bytes.
  • Transport Layer for example MPEG2 TS (Transport Stream)
  • EMM EMM carrying personal information, view entitlement and modifier keys for a service program
  • ECM Entitlement Control Message
  • a transmitting node of an MPEG system generates a Control Word (hereinafter, referred to as CW ) which functions to scramble broadcast data.
  • the generated CW is used to scramble broadcast data.
  • the generated CW is encrypted inside the ECM and transmitted to a receiving node.
  • a key which is used to encrypt the CW, is included in the EMM and transmitted to the receiving node.
  • the ECM and the EMM are transferred as an MPEG2 TS packet each having a different packet identifier (hereinafter, referred to as PID ).
  • a value of the PID is the same as a value of a given PID as directed in a CA_PID field of a CA descriptor inside both a PMT (Program Map Table) and a CAT (Conditional Access Table) among PSI (Program Specific Information) tables prescribed in an MPEG2 system. Then, the receiving node first searches for a TS packet including a PAT table in a broadcast data stream, parses the PAT table, obtains a PID value of a PMT table for the corresponding broadcasting program, searches for a TS packet having that value and parses the PMT table, in order to view a specific, scrambled broadcasting program.
  • the ECM By obtaining a PID value of the TS Packet including an ECM through parsing the PMT table and finding the TS packet with the ECM, the ECM is obtained. Also, in order to get the CW from the ECM, decryption of the ECM is needed. Therefore, through parsing the CAT table after receiving a TS packet including a CAT table, obtaining a PID of a TS packet including the EMM, and searching for the TS packet including the EMM, the EMM is obtained. Then, by obtaining a key for decrypting the ECM from the EMM and performing the decryption of the ECM using that key, a resultant CW is obtained. Subsequently, the obtained CW is transferred to a descrambler of the receiver, and thus the scrambled broadcast program is transformed into a viewable format.
  • a subscription EMM is broadcast after subscription, and particularly the EMM is usually transmitted every two minutes for one week for safe reception.
  • the EMM contains a subscriber key, which is a unique key for each card managed in a CAS, group/position information determined at the time of registration in a CAS DB, a key for each group, package information, validity period, etc.
  • a receiver of a new subscriber can receive a broadcast, only after it receives the EMM. That is, there exists a problem in that a newly registered subscriber cannot view a broadcast through his receiver until he receives the subscription EMM. In other words, a user experiences a subscription standby time.
  • an object of the present invention is to provide a prepaid broadcasting receiver including a subscription EMM storage unit for storing service subscription information among subscription EMMs, the service subscription information comprising information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, wherein the prepaid broadcasting receiver receives the CAS-based digital broadcasting by using the service subscription information stored in advance in the subscription EMM storage unit.
  • a further object of the present invention is to provide a method of processing prepaid subscriber information by using a prepaid broadcasting receiver comprising a subscription EMM storage unit storing the service subscription information, the method comprising the steps of: (a) generating a subscription signal containing purchase information on the prepaid broadcasting receiver of the subscriber and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server; and (b) receiving the subscription signal, and then providing CAS-based digital broadcasting service for the prepaid broadcasting receiver by the CAS broadcasting server.
  • a prepaid broadcasting receiver with a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, wherein the prepaid broadcasting receiver receives the CAS-based digital broadcasting by using the service subscription information stored in advance in the subscription EMM storage unit.
  • the broadcast reception limitation information includes a subscriber key, group/position information registered in a CAS database, and a group key.
  • the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
  • a subscription EMM storage unit for a prepaid broadcasting receiver receiving service subscription information from subscription EMMs and storing the received service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting.
  • the broadcast reception limitation information includes a subscriber key, group/position information registered in a CAS database, and a group key.
  • the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
  • a subscriber management system using a prepaid broadcasting receiver including a prepaid broadcasting receiver, a subscription center server and a CAS broadcasting server
  • the prepaid broadcasting receiver comprises a subscription EMM storage unit for storing service subscription information among subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting after subscription to CAS-based digital broadcasting service
  • the subscription center server generates purchase authentication information including information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased and transmits it to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit
  • the prepaid broadcasting receiver having the subscription EMM storage unit receives the CAS- based digital broadcasting service based on the purchase authentication information.
  • the subscription center server transmits the purchase authentication information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving the CAS-based digital broadcasting service based on the purchase authentication information.
  • the subscription center server generates a subscription code for the purchase authentication information and informs the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit so that the EMM storage unit or the prepaid broadcasting receiver having that storage unit switches into an active mode for receiving the CAS-based digital broadcasting service.
  • the subscription center server generates the purchase authentication information by interworking with the CAS broadcasting server.
  • a subscriber management system using a prepaid broadcasting receiver including a prepaid broadcasting receiver, a subscription center server, a subscriber management server, and a CAS broadcasting server.
  • the prepaid broadcasting receiver comprises a subscription EMM storage unit for storing service subscription information among the first subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription excepting specific information such as viewable channel-related information and viewable period-related information, the first subscription EMMs comprising broadcast reception limitation information needed for initial reception of a CAS-based digital broadcasting after subscription to CAS-based digital broadcasting service, the subscription center server generates purchase authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased and transmits it to the subscriber management server, the subscriber management server requests the CAS broadcasting server to provide the second subscription EMM containing the specific information upon receiving the purchase authentication information, and if provided, then extracts information needed for service subscription from the second subscription EMM and reconstructs the service subscription information and transmits it to the subscription center server, the subscription center server transmits the reconstructed service subscription information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and
  • the subscription center server transmits the purchase authentication information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving the CAS-based digital broadcasting service, based on the purchase authentication information.
  • the subscription center server generates a subscription code for the purchase authentication information, and informs the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit so that the EMM storage unit or the prepaid broadcasting receiver having that storage unit switches into an active mode for receiving the CAS-based digital broadcasting service.
  • the subscription center server generates the purchase authentication information by interworking with the CAS broadcasting server.
  • the broadcast reception limitation information includes a subscriber key, group/position information registered in a CAS database, and a group key.
  • the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
  • a method of processing prepaid subscriber information by using a prepaid broadcasting receiver comprising a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, the method comprising the steps of: (a) generating the purchase authentication information and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server, the authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased; and (b) receiving the CAS-based digital broadcasting service based on the purchase authentication information by the prepaid broadcasting receiver having the subscription EMM storage unit.
  • a method of processing prepaid subscriber information by using a prepaid broadcasting receiver comprising a subscription EMM storage unit for generating service subscription information from the first subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription excepting specific information such as viewable channel-related information and viewable period-related information, the first subscription EMMs comprising broadcast reception limitation information, the method comprising the steps of: (a) generating the purchase authentication information and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server, the authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased; (b) requesting a CAS broadcasting server to provide the second subscription EMM containing the specific information by the subscriber management server when the purchase authentication information is received, and if the second subscription EMM is provided, then extracting information needed for service subscription from the
  • the broadcast reception limitation information needed for initial broadcast reception of a CAS-based digital broadcasting includes a subscriber key, group/ position information registered in a CAS database, and a group key.
  • the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
  • the present invention can reduce the cumbersome job of writing the subscriber s personal data, the way of payment of the monthly fee, and the like in a subscription application. That is, according to the present invention, if a user pays a certain fee according to a new registration during the purchase of a digital receiver, he does not need to wait until a subscription EMM arrives separately, but can receive a broadcast immediately. Furthermore, the broadcast receiver of the present invention can minimize the waste of In-band transmitting bandwidth due to transmission of an EMM for a new subscriber through In-band signaling.
  • FIG. 1 is a diagram showing the procedure of inputting service subscription information to a subscription EMM storage unit in accordance with an embodiment of the present invention
  • FIG. 2 is a diagram showing in detail the procedure of inputting service subscription information to a subscription EMM storage unit as shown in FIG. 1 ;
  • FIG. 3 is a diagram showing the procedure of activating a broadcasting receiver having a subscription EMM storage unit as shown in FIG. 1;
  • FIG. 4 is a flow chart showing the procedure including the steps of storing service subscription information in a subscription EMM storage unit through activating a broadcasting receiver having a subscription EMM storage unit as shown in FIG. 1.
  • FIG. 1 is a diagram showing the procedure of inputting service subscription information to a subscription EMM storage unit in accordance with an embodiment of the present invention.
  • a subscription processing system 200 stores subscription EMM information in a subscription EMM storage unit 100.
  • the subscription EMM in- formation is transmitted from a CAS broadcasting server 300 to the subscription processing system 200.
  • the subscription processing system 200 generates service subscription information necessary for service subscription from the subscription EMM information and stores the same in the subscription EMM storage unit 100. Therefore, the storage unit 100 stores the service subscription information.
  • the subscription EMM storage unit 100 includes a portable card or chip, such as a SIM (subscriber identification module) card or a SMD (surface mounted device) card, etc.
  • the subscription EMM storage unit 110 storing the service subscription information can be equipped with a broadcasting receiver 130 in advance so that a subscriber pays a subscription fee and purchases the broadcasting receiver 130, or a subscriber purchases only a subscription EMM storage unit 110 and then mounts it on a broadcasting receiver for immediate reception of a broadcast. Therefore, the subscriber can view the broadcast immediately as the broadcasting receiver 130 does not need to receive a separate subscription EMM necessary for an initial broadcast reception.
  • a CAS-based broadcast refers to a digital broadcast or a mobile broadcasting served on a mobile network.
  • a DMB -based digital broadcast is, hereinafter, described as one example.
  • Broadcast reception limitation information needed for initial reception of a CAS- based digital broadcast includes a unique key, that is a subscriber key, for an individual card, a key for an individual group, viewable channel information and viewable period information.
  • a broadcast receiver having a storage unit which stores the first subscription EMM information excepting the viewable channel information and the viewable period information broadcast reception is available only after a broadcast receiver receives the second subscription EMM information, such as the viewable channel information and the viewable period information, separately at the time of subscription.
  • a subscription processing system inputs service subscription information to a subscription EMM storage unit 110 or a broadcast receiver 130 having the subscription EMM storage unit 110 as mentioned above. Thereafter, a new subscriber purchases the subscription EMM storage unit 110 or the broadcast receiver 130 having the subscription EMM storage unit 110 and newly subscribes to a CAS-based digital broadcasting service.
  • a subscription center 400 instructs a CAS broadcasting server 300 to process the subscription, then the CAS broadcasting server 300 receives the subscription signal and provides the CAS-based digital broadcasting service for the broadcast receiver 130 having the subscription EMM storage unit 110.
  • FIG. 2 is a diagram showing in detail the procedure of inputting service subscription information to a subscription EMM storage unit as shown in FIG. 1.
  • the subscription EMM storage unit 100 is constructed as a subscription EMM storage unit 120 issuance completed through a CAS issuing system 210 without having service subscription information stored.
  • the issuance completed subscription EMM storage unit 120 can be distributed as a subscription EMM storage unit 120 itself or a broadcast receiver 130 having a subscription EMM storage unit 120 as described above. Then, a new subscriber purchases the distributed subscription EMM storage unit 120 itself or a broadcast receiver 130 having a subscription EMM storage unit 120. The subscriber should receive a subscription EMM through a CAS subscription system 220 and a CAS broadcasting server 300 and perform a separate procedure for subscription-processing to subscribe to a CAS-based digital broadcasting service for service running.
  • the subscription EMM storage unit 100 is constructed as a subscription EMM storage unit 110 which stores service subscription information through a CAS subscription system 220, and which is subscription-processed.
  • the broadcast receiver 130 is equipped with the subscription processed subscription EMM storage unit 110, and can receive a CAS-based digital broadcast through a CAS subscription authentication procedure.
  • the subscription EMM storage unit 100 does not keep an EMM itself but service subscription information included in the EMM necessary for service subscription. That is, the subscription EMM storage unit 100 keeps some information transferred together with the service subscription information as newly subscribed to the broadcast service.
  • the CAS subscription system 200 performs the procedure of receiving the subscription EMM from a CAS broadcasting server 300 and storing the corresponding service subscription information in the subscription EMM storage unit 100. In this procedure, all information on the subscription EMM to be transferred as newly subscribed to the broadcast service can be stored or some of the information is only stored, according to the service provider s policies.
  • FIG. 3 is a diagram showing the procedure of activating a broadcasting receiver having a subscription EMM storage unit as shown in FIG 1.
  • the subscriber performs terminal registration and an opening request to the subscription center server 400 to initiate broadcasting service through a subscription EMM storage unit 110 or the prepaid subscriber broadcasting receiver 130 having the subscription EMM storage unit 110.
  • the subscription center server 400 generates purchase authentication information including information on whether the subscription EMM storage unit 110 or the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110 is purchased, and then transmits it to the subscription EMM storage unit 110 or the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110. Then, the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110 switches into an active mode for receiving the CAS-based digital broadcasting service based on the purchase authentication information in order to initiate the corresponding broadcasting service.
  • the subscription center server 400 determines the service subscription information which is stored, in advance, in the subscription EMM storage unit 110. If the subscription EMM storage unit 110 does not include the whole information necessary for initiating the CAS-based digital broadcast, then the subscription center server 400 receives the required additional information by interworking with the CAS broadcasting server 300 and inputs the received information into the subscription E MM storage unit 110.
  • the subscription center server 400 is configured to generate a subscription code for the purchase authentication information and inform the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit 110 or the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110. Therefore, the EMM storage unit 110 or the prepaid broadcasting receiver having that storage unit 130 switches into an active mode for receiving the CAS-based digital broadcasting service.
  • FIG. 4 is a flow chart showing the procedure including the steps of storing service subscription information in a subscription EMM storage unit 100 as shown in FIG. 1 through activating a broadcasting receiver 130 having a subscription EMM storage unit [59]
  • a subscription processing system requests a CAS broadcasting server to process prepaid subscription in step 100.
  • the CAS broadcasting server generates broadcast reception limitation information containing a prepaid viewing channel frequency range and viewing period related settings in step 102.
  • the CAS broadcasting server transmits a subscription EMM containing CAS subscription authentication information and broadcasts reception limitation information to the subscription processing system in step 104.
  • the subscription processing system generates service subscription information based on the information transmitted from the CAS broadcasting server, and inputs the generated service subscription information into the subscription EMM storage unit in step 106 through 110.
  • a broadcast subscriber makes a purchase of the subscription EMM storage unit or the broadcasting receiver having the subscription EMM storage unit, and requests the subscription center server to provide the corresponding broadcasting service using the broadcasting receiver.
  • the subscription center server In response to the request, the subscription center server generates purchase authentication information corresponding to the purchase of the subscription EMM storage unit or the broadcasting receiver having the subscription EMM storage unit, and transmits it to the subscription EMM storage unit or the broadcasting receiver having the subscription EMM storage unit. Therefore, the broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving a broadcast in step 112 through 116.
  • the broadcasting receiver having the subscription EMM storage unit initiates the corresponding broadcast service through the active mode in step 118.

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Disclosed is a prepaid broadcasting receiver and a storage unit for the prepaid broadcasting receiver. The present invention includes a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, wherein the prepaid broadcasting receiver receives the CAS-based digital broadcasting by using the service subscription information stored in advance in the subscription EMM storage unit. Therefore, the present invention can simplify a complicated procedure during a new subscription to a CAS-based digital broadcasting, radically decrease stand-by time from a subscription to an initial broadcast reception, and employ a bandwidth for broadcast, which was used up for subscription EMMs, for other uses.

Description

Description
PREPAID BROADCASTING RECEIVER AND SUBSCRIBER
MANAGEMENT SYSTEM AND METHOD THEREOF IN
DIGITAL MULTIMEDIA BROADCASTING SERVICE
Technical Field
[1] The present invention relates to a method, system and CAS-based digital broadcasting receiver for rapidly processing EMMs (Entitlement Management Messages) needed for an initial broadcast reception in a receiver of a subscriber who is newly registered in a Condition Access System for digital broadcasting, without using a frequency band for broadcasting.
[2]
Background Art
[3] Nowadays, a digital broadcasting system employs a Condition Access System
(hereinafter, referred to as CAS) having confidentiality, integrity, availability, accountability, authenticity and reliability, in order to protect broadcast contents.
[4] Packet information for the CAS is usually transferred through a Transport Layer, for example MPEG2 TS (Transport Stream), in which an EMM carrying personal information, view entitlement and modifier keys for a service program is transferred through a TS packet of 188 bytes if a subscriber is newly registered or changed, and an ECM (Entitlement Control Message) carrying event access and decoding information is periodically transferred through a TS packet of 188 bytes.
[5] A transmitting node of an MPEG system generates a Control Word (hereinafter, referred to as CW ) which functions to scramble broadcast data. The generated CW is used to scramble broadcast data. The generated CW is encrypted inside the ECM and transmitted to a receiving node. Meanwhile, a key, which is used to encrypt the CW, is included in the EMM and transmitted to the receiving node. Herein, the ECM and the EMM are transferred as an MPEG2 TS packet each having a different packet identifier (hereinafter, referred to as PID ). A value of the PID is the same as a value of a given PID as directed in a CA_PID field of a CA descriptor inside both a PMT (Program Map Table) and a CAT (Conditional Access Table) among PSI (Program Specific Information) tables prescribed in an MPEG2 system. Then, the receiving node first searches for a TS packet including a PAT table in a broadcast data stream, parses the PAT table, obtains a PID value of a PMT table for the corresponding broadcasting program, searches for a TS packet having that value and parses the PMT table, in order to view a specific, scrambled broadcasting program. By obtaining a PID value of the TS Packet including an ECM through parsing the PMT table and finding the TS packet with the ECM, the ECM is obtained. Also, in order to get the CW from the ECM, decryption of the ECM is needed. Therefore, through parsing the CAT table after receiving a TS packet including a CAT table, obtaining a PID of a TS packet including the EMM, and searching for the TS packet including the EMM, the EMM is obtained. Then, by obtaining a key for decrypting the ECM from the EMM and performing the decryption of the ECM using that key, a resultant CW is obtained. Subsequently, the obtained CW is transferred to a descrambler of the receiver, and thus the scrambled broadcast program is transformed into a viewable format.
[6] In an EMM for the CAS, the occurrence of a packet suddenly increases according to new registration requests and entitlement change requests of subscribers, and also in an ECM, packet occurrence relatively increases according to the period of transfer repetition. In particular, with portable DMB (Digital Multimedia Broadcasting) having narrow transmission bandwidth and lower resolution, message packets for a CAS are limited in resource allocation compared to only audio and video data packets. Packets of a message for a CAS are limited in resource allocation, in comparison with pure audio and video data packets.
[7] Also, with the new registration of a subscriber, a subscription EMM is broadcast after subscription, and particularly the EMM is usually transmitted every two minutes for one week for safe reception. The EMM contains a subscriber key, which is a unique key for each card managed in a CAS, group/position information determined at the time of registration in a CAS DB, a key for each group, package information, validity period, etc. A receiver of a new subscriber can receive a broadcast, only after it receives the EMM. That is, there exists a problem in that a newly registered subscriber cannot view a broadcast through his receiver until he receives the subscription EMM. In other words, a user experiences a subscription standby time.
[8]
Disclosure of Invention Technical Problem
[9] Accordingly, the present invention has been made to solve at least the above- mentioned problems occurring in the prior art, and an object of the present invention is to provide a prepaid broadcasting receiver including a subscription EMM storage unit for storing service subscription information among subscription EMMs, the service subscription information comprising information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, wherein the prepaid broadcasting receiver receives the CAS-based digital broadcasting by using the service subscription information stored in advance in the subscription EMM storage unit. A further object of the present invention is to provide a method of processing prepaid subscriber information by using a prepaid broadcasting receiver comprising a subscription EMM storage unit storing the service subscription information, the method comprising the steps of: (a) generating a subscription signal containing purchase information on the prepaid broadcasting receiver of the subscriber and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server; and (b) receiving the subscription signal, and then providing CAS-based digital broadcasting service for the prepaid broadcasting receiver by the CAS broadcasting server.
[10]
Technical Solution
[11] In accordance with the first aspect of the present invention, there is provided a prepaid broadcasting receiver with a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, wherein the prepaid broadcasting receiver receives the CAS-based digital broadcasting by using the service subscription information stored in advance in the subscription EMM storage unit.
[12] Preferably, the broadcast reception limitation information includes a subscriber key, group/position information registered in a CAS database, and a group key.
[13] Preferably, the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
[14] In accordance with the second aspect of the present invention, there is provided a subscription EMM storage unit for a prepaid broadcasting receiver, the subscription EMM storage unit receiving service subscription information from subscription EMMs and storing the received service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting.
[15] Preferably, the broadcast reception limitation information includes a subscriber key, group/position information registered in a CAS database, and a group key.
[16] Preferably, the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
[17] In accordance with the third aspect of the present invention, there is provided a subscriber management system using a prepaid broadcasting receiver, the subscriber management system including a prepaid broadcasting receiver, a subscription center server and a CAS broadcasting server, wherein the prepaid broadcasting receiver comprises a subscription EMM storage unit for storing service subscription information among subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting after subscription to CAS-based digital broadcasting service, the subscription center server generates purchase authentication information including information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased and transmits it to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the prepaid broadcasting receiver having the subscription EMM storage unit receives the CAS- based digital broadcasting service based on the purchase authentication information.
[18] Preferably, the subscription center server transmits the purchase authentication information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving the CAS-based digital broadcasting service based on the purchase authentication information.
[19] Preferably, the subscription center server generates a subscription code for the purchase authentication information and informs the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit so that the EMM storage unit or the prepaid broadcasting receiver having that storage unit switches into an active mode for receiving the CAS-based digital broadcasting service.
[20] Preferably, the subscription center server generates the purchase authentication information by interworking with the CAS broadcasting server.
[21] In accordance with the fourth aspect of the present invention, there is provided a subscriber management system using a prepaid broadcasting receiver, the system including a prepaid broadcasting receiver, a subscription center server, a subscriber management server, and a CAS broadcasting server. Herein, the prepaid broadcasting receiver comprises a subscription EMM storage unit for storing service subscription information among the first subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription excepting specific information such as viewable channel-related information and viewable period-related information, the first subscription EMMs comprising broadcast reception limitation information needed for initial reception of a CAS-based digital broadcasting after subscription to CAS-based digital broadcasting service, the subscription center server generates purchase authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased and transmits it to the subscriber management server, the subscriber management server requests the CAS broadcasting server to provide the second subscription EMM containing the specific information upon receiving the purchase authentication information, and if provided, then extracts information needed for service subscription from the second subscription EMM and reconstructs the service subscription information and transmits it to the subscription center server, the subscription center server transmits the reconstructed service subscription information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the prepaid broadcasting receiver having the subscription EMM storage unit receives the CAS- based digital broadcasting service based on the purchase authentication information.
[22] Preferably, the subscription center server transmits the purchase authentication information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving the CAS-based digital broadcasting service, based on the purchase authentication information.
[23] Preferably, the subscription center server generates a subscription code for the purchase authentication information, and informs the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit so that the EMM storage unit or the prepaid broadcasting receiver having that storage unit switches into an active mode for receiving the CAS-based digital broadcasting service.
[24] Preferably, the subscription center server generates the purchase authentication information by interworking with the CAS broadcasting server.
[25] Preferably, the broadcast reception limitation information includes a subscriber key, group/position information registered in a CAS database, and a group key.
[26] Preferably, the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information.
[27] In accordance with the fifth aspect of the present invention, there is provided a method of processing prepaid subscriber information by using a prepaid broadcasting receiver comprising a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, the method comprising the steps of: (a) generating the purchase authentication information and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server, the authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased; and (b) receiving the CAS-based digital broadcasting service based on the purchase authentication information by the prepaid broadcasting receiver having the subscription EMM storage unit.
[28] In accordance with the sixth aspect of the present invention, there is provided a method of processing prepaid subscriber information by using a prepaid broadcasting receiver comprising a subscription EMM storage unit for generating service subscription information from the first subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription excepting specific information such as viewable channel-related information and viewable period-related information, the first subscription EMMs comprising broadcast reception limitation information, the method comprising the steps of: (a) generating the purchase authentication information and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server, the authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased; (b) requesting a CAS broadcasting server to provide the second subscription EMM containing the specific information by the subscriber management server when the purchase authentication information is received, and if the second subscription EMM is provided, then extracting information needed for service subscription from the second subscription EMM and reconstructing the service subscription information by the subscriber management server; (c) transmitting the reconstructed service subscription information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by the subscription center server; and (d) receiving the CAS-based digital broadcasting service based on the purchase authentication information, by the prepaid broadcasting receiver with the subscription EMM storage unit.
[29] Preferably, the broadcast reception limitation information needed for initial broadcast reception of a CAS-based digital broadcasting includes a subscriber key, group/ position information registered in a CAS database, and a group key. [30] Preferably, the broadcast reception limitation information further includes viewable channel-related information and viewable period-related information. [31] [32]
Advantageous Effects
[33] Therefore, the present invention can reduce the cumbersome job of writing the subscriber s personal data, the way of payment of the monthly fee, and the like in a subscription application. That is, according to the present invention, if a user pays a certain fee according to a new registration during the purchase of a digital receiver, he does not need to wait until a subscription EMM arrives separately, but can receive a broadcast immediately. Furthermore, the broadcast receiver of the present invention can minimize the waste of In-band transmitting bandwidth due to transmission of an EMM for a new subscriber through In-band signaling. Brief Description of Drawings
[34] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
[35] FIG. 1 is a diagram showing the procedure of inputting service subscription information to a subscription EMM storage unit in accordance with an embodiment of the present invention;
[36] FIG. 2 is a diagram showing in detail the procedure of inputting service subscription information to a subscription EMM storage unit as shown in FIG. 1 ;
[37] FIG. 3 is a diagram showing the procedure of activating a broadcasting receiver having a subscription EMM storage unit as shown in FIG. 1; and
[38] FIG. 4 is a flow chart showing the procedure including the steps of storing service subscription information in a subscription EMM storage unit through activating a broadcasting receiver having a subscription EMM storage unit as shown in FIG. 1.
[39]
Mode for the Invention
[40] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
[41] FIG. 1 is a diagram showing the procedure of inputting service subscription information to a subscription EMM storage unit in accordance with an embodiment of the present invention.
[42] Referring to FIG. 1, a subscription processing system 200 stores subscription EMM information in a subscription EMM storage unit 100. The subscription EMM in- formation is transmitted from a CAS broadcasting server 300 to the subscription processing system 200. The subscription processing system 200 generates service subscription information necessary for service subscription from the subscription EMM information and stores the same in the subscription EMM storage unit 100. Therefore, the storage unit 100 stores the service subscription information. The subscription EMM storage unit 100 includes a portable card or chip, such as a SIM (subscriber identification module) card or a SMD (surface mounted device) card, etc. The subscription EMM storage unit 110 storing the service subscription information can be equipped with a broadcasting receiver 130 in advance so that a subscriber pays a subscription fee and purchases the broadcasting receiver 130, or a subscriber purchases only a subscription EMM storage unit 110 and then mounts it on a broadcasting receiver for immediate reception of a broadcast. Therefore, the subscriber can view the broadcast immediately as the broadcasting receiver 130 does not need to receive a separate subscription EMM necessary for an initial broadcast reception.
[43] Herein, a CAS-based broadcast refers to a digital broadcast or a mobile broadcasting served on a mobile network. For detailed description thereof, a DMB -based digital broadcast is, hereinafter, described as one example.
[44] Broadcast reception limitation information needed for initial reception of a CAS- based digital broadcast includes a unique key, that is a subscriber key, for an individual card, a key for an individual group, viewable channel information and viewable period information. However, for a broadcast receiver having a storage unit which stores the first subscription EMM information excepting the viewable channel information and the viewable period information, broadcast reception is available only after a broadcast receiver receives the second subscription EMM information, such as the viewable channel information and the viewable period information, separately at the time of subscription.
[45] Hereinafter, an embodiment of a DMB prepaid subscriber management system according to the present invention will be described. That is, a subscription processing system inputs service subscription information to a subscription EMM storage unit 110 or a broadcast receiver 130 having the subscription EMM storage unit 110 as mentioned above. Thereafter, a new subscriber purchases the subscription EMM storage unit 110 or the broadcast receiver 130 having the subscription EMM storage unit 110 and newly subscribes to a CAS-based digital broadcasting service. Herein, a subscription center 400 instructs a CAS broadcasting server 300 to process the subscription, then the CAS broadcasting server 300 receives the subscription signal and provides the CAS-based digital broadcasting service for the broadcast receiver 130 having the subscription EMM storage unit 110.
[46] FIG. 2 is a diagram showing in detail the procedure of inputting service subscription information to a subscription EMM storage unit as shown in FIG. 1.
[47] Referring to FIG. 2, if a DMB prepaid subscriber management system operates the subscription EMM storage unit 100 through an issue -related PerSAM 410, the subscription EMM storage unit 100 is constructed as a subscription EMM storage unit 120 issuance completed through a CAS issuing system 210 without having service subscription information stored.
[48] The issuance completed subscription EMM storage unit 120 can be distributed as a subscription EMM storage unit 120 itself or a broadcast receiver 130 having a subscription EMM storage unit 120 as described above. Then, a new subscriber purchases the distributed subscription EMM storage unit 120 itself or a broadcast receiver 130 having a subscription EMM storage unit 120. The subscriber should receive a subscription EMM through a CAS subscription system 220 and a CAS broadcasting server 300 and perform a separate procedure for subscription-processing to subscribe to a CAS-based digital broadcasting service for service running.
[49] On the other hand, if a DMB prepaid subscriber management system operates the subscription EMM storage unit 100 through a subscription Persam 420, the subscription EMM storage unit 100 is constructed as a subscription EMM storage unit 110 which stores service subscription information through a CAS subscription system 220, and which is subscription-processed.
[50] Therefore, the broadcast receiver 130 is equipped with the subscription processed subscription EMM storage unit 110, and can receive a CAS-based digital broadcast through a CAS subscription authentication procedure.
[51] Furthermore, the subscription EMM storage unit 100 does not keep an EMM itself but service subscription information included in the EMM necessary for service subscription. That is, the subscription EMM storage unit 100 keeps some information transferred together with the service subscription information as newly subscribed to the broadcast service. The CAS subscription system 200 performs the procedure of receiving the subscription EMM from a CAS broadcasting server 300 and storing the corresponding service subscription information in the subscription EMM storage unit 100. In this procedure, all information on the subscription EMM to be transferred as newly subscribed to the broadcast service can be stored or some of the information is only stored, according to the service provider s policies.
[52] For example, some information related to group information, KEY information, etc. is transmitted to the subscription EMM storage unit 100, but subscription package information is transferred on a broadcasting network as a subscriber purchases a broadcasting terminal. Also, a CAS broadcasting server 300 transmits a subscription EMM to a CAS subscription system 220, and particularly, it is possible to transmit the subscription EMM by the standards defined to guarantee security. [53] FIG. 3 is a diagram showing the procedure of activating a broadcasting receiver having a subscription EMM storage unit as shown in FIG 1.
[54] Referring to FIG. 3, when a subscriber purchases a subscription EMM storage unit
110 storing, in advance, service subscription information among subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, or the prepaid subscriber broadcasting receiver 130 having the subscription EMM storage unit 110, the subscriber performs terminal registration and an opening request to the subscription center server 400 to initiate broadcasting service through a subscription EMM storage unit 110 or the prepaid subscriber broadcasting receiver 130 having the subscription EMM storage unit 110.
[55] Subsequently, the subscription center server 400 generates purchase authentication information including information on whether the subscription EMM storage unit 110 or the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110 is purchased, and then transmits it to the subscription EMM storage unit 110 or the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110. Then, the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110 switches into an active mode for receiving the CAS-based digital broadcasting service based on the purchase authentication information in order to initiate the corresponding broadcasting service.
[56] Herein, the subscription center server 400 determines the service subscription information which is stored, in advance, in the subscription EMM storage unit 110. If the subscription EMM storage unit 110 does not include the whole information necessary for initiating the CAS-based digital broadcast, then the subscription center server 400 receives the required additional information by interworking with the CAS broadcasting server 300 and inputs the received information into the subscription E MM storage unit 110.
[57] Also, the subscription center server 400 is configured to generate a subscription code for the purchase authentication information and inform the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit 110 or the prepaid broadcasting receiver 130 having the subscription EMM storage unit 110. Therefore, the EMM storage unit 110 or the prepaid broadcasting receiver having that storage unit 130 switches into an active mode for receiving the CAS-based digital broadcasting service.
[58] FIG. 4 is a flow chart showing the procedure including the steps of storing service subscription information in a subscription EMM storage unit 100 as shown in FIG. 1 through activating a broadcasting receiver 130 having a subscription EMM storage unit [59] Referring to FIG. 4, a broadcast prepaid subscriber management method according to the present invention is described. First, a subscription processing system requests a CAS broadcasting server to process prepaid subscription in step 100. In response to the request, the CAS broadcasting server generates broadcast reception limitation information containing a prepaid viewing channel frequency range and viewing period related settings in step 102. Then, the CAS broadcasting server transmits a subscription EMM containing CAS subscription authentication information and broadcasts reception limitation information to the subscription processing system in step 104.
[60] Next, the subscription processing system generates service subscription information based on the information transmitted from the CAS broadcasting server, and inputs the generated service subscription information into the subscription EMM storage unit in step 106 through 110.
[61] Then, a broadcast subscriber makes a purchase of the subscription EMM storage unit or the broadcasting receiver having the subscription EMM storage unit, and requests the subscription center server to provide the corresponding broadcasting service using the broadcasting receiver.
[62] In response to the request, the subscription center server generates purchase authentication information corresponding to the purchase of the subscription EMM storage unit or the broadcasting receiver having the subscription EMM storage unit, and transmits it to the subscription EMM storage unit or the broadcasting receiver having the subscription EMM storage unit. Therefore, the broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving a broadcast in step 112 through 116.
[63] Then, the broadcasting receiver having the subscription EMM storage unit initiates the corresponding broadcast service through the active mode in step 118.
[64] Although preferred embodiments of the present invention have been described in detail for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
[65]
[66]

Claims

Claims
[ 1 ] A prepaid broadcasting receiver comprising: a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, wherein the prepaid broadcasting receiver receives the CAS-based digital broadcasting by using the service subscription information stored in advance in the subscription EMM storage unit.
[2] The receiver as claimed in claim 1, wherein the broadcast reception limitation information comprises a subscriber key, group/position information registered in a CAS database, and a group key.
[3] The receiver as claimed in claim 2, wherein the broadcast reception limitation information further comprises viewable channel-related information and viewable period-related information.
[4] A subscription EMM storage unit for a prepaid broadcasting receiver, the subscription EMM storage unit receiving service subscription information from subscription EMMs and storing the received service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting.
[5] The storage unit as claimed in claim 4, wherein the broadcast reception limitation information comprises a subscriber key, group/position information registered in a CAS database, and a group key.
[6] The storage unit as claimed in claim 5, wherein the broadcast reception limitation information further comprises viewable channel-related information and viewable period-related information.
[7] A subscriber management system using a prepaid broadcasting receiver, the subscriber management system comprising a prepaid broadcasting receiver, a subscription center server and a CAS broadcasting server, wherein the prepaid broadcasting receiver comprises a subscription EMM storage unit for storing service subscription information among subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting after subscription to a CAS-based digital broadcasting service, the subscription center server generates purchase authentication information including information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased and transmits it to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the prepaid broadcasting receiver having the subscription EMM storage unit receives the CAS-based digital broadcasting service based on the purchase authentication information.
[8] The system as claimed in claim 7, wherein the subscription center server transmits the purchase authentication information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving the CAS-based digital broadcasting service based on the purchase authentication information.
[9] The system as claimed in claim 8, wherein the subscription center server generates a subscription code for the purchase authentication information, and informs the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit so that the EMM storage unit or the prepaid broadcasting receiver having that storage unit switches into an active mode for receiving the CAS-based digital broadcasting service.
[10] The system as claimed in claim 8 or 9, wherein the subscription center server generates the purchase authentication information by interworking with the CAS broadcasting server.
[11] A subscriber management system using a prepaid broadcasting receiver, the subscriber management system comprising a prepaid broadcasting receiver, a subscription center server, a subscriber management server, and a CAS broadcasting server, wherein the prepaid broadcasting receiver comprises a subscription EMM storage unit for storing service subscription information among the first subscription EMMs, the service subscription information comprising at least one piece of information necessary for service subscription excepting specific information such as viewable channel-related information and viewable period- related information, the first subscription EMMs comprising broadcast reception limitation information needed for initial reception of a CAS-based digital broadcasting after subscription to CAS-based digital broadcasting service, the subscription center server generates purchase authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased and transmits it to the subscriber management server, the subscriber management server requests the CAS broadcasting server to provide the second subscription EMM containing the specific information upon receiving the purchase authentication information, and if provided, then extracts information needed for service subscription from the second subscription EMM and reconstructs the service subscription information and transmits it to the subscription center server, the subscription center server transmits the reconstructed service subscription information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the prepaid broadcasting receiver having a subscription EMM storage unit receives the CAS-based digital broadcasting service based on the purchase authentication information.
[12] The system as claimed in claim 11, wherein the subscription center server transmits the purchase authentication information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit, and the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit switches into an active mode for receiving the CAS-based digital broadcasting service, based on the purchase authentication information.
[13] The system as claimed in claim 11, wherein the subscription center server generates a subscription code for the purchase authentication information and informs the subscriber of it, thereby allowing the subscriber to input the subscription code into the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit so that the EMM storage unit or the prepaid broadcasting receiver having that storage unit switches into an active mode for receiving the CAS-based digital broadcasting service.
[14] The system as claimed in claim 12 or 13, wherein the subscription center server generates the purchase authentication information by interworking with the CAS broadcasting server.
[15] The system as claimed in claim 7 or 11, wherein the broadcast reception limitation information comprises a subscriber key, group/position information registered in a CAS database, and a group key.
[16] The system as claimed in claim 15, wherein the broadcast reception limitation information further comprises viewable channel-related information and viewable period-related information.
[17] A method of processing a prepaid subscriber by using a prepaid broadcasting receiver comprising a subscription EMM storage unit for generating service subscription information from subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription for broadcast reception, the subscription EMMs comprising broadcast reception limitation information necessary for initial reception of a CAS-based digital broadcasting, the method comprising the steps of:
(a) generating the purchase authentication information and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server, the authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased; and
(b) receiving the CAS-based digital broadcasting service based on the purchase authentication information by the prepaid broadcasting receiver having the subscription EMM storage unit.
[18] A method of processing a prepaid subscriber by using a prepaid broadcasting receiver comprising a subscription EMM storage unit for generating service subscription information from the first subscription EMMs and storing the generated service subscription information, the service subscription information comprising at least one piece of information necessary for service subscription excepting specific information such as viewable channel-related information and viewable period-related information, the first subscription EMMs comprising broadcast reception limitation information, the method comprising the steps of:
(a) generating the purchase authentication information and transmitting to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by a subscription center server, the authentication information comprising information on whether the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit is purchased;
(b) requesting a CAS broadcasting server to provide the second subscription EMM containing the specific information by the subscriber management server when the purchase authentication information is received, and if the second subscription EMM is provided, then extracting information needed for service subscription from the second subscription EMM and reconstructing the service subscription information by the subscriber management server;
(c) transmitting the reconstructed service subscription information to the subscription EMM storage unit or the prepaid broadcasting receiver having the subscription EMM storage unit by the subscription center server; and
(d) receiving the CAS-based digital broadcasting service based on the purchase authentication information, by the prepaid broadcasting receiver with the subscription EMM storage unit.
[19] The method as claimed in claim 17 or 18, wherein the broadcast reception limitation information comprises a subscriber key, group/position information registered in a CAS database, and a group Key. [20] The method as claimed in claim 19, wherein the broadcast reception limitation information further comprises viewable channel-related information and viewable period-related information.
PCT/KR2008/007340 2007-12-11 2008-12-11 Prepaid broadcasting receiver and subscriber management system and method thereof in digital multimedia broadcasting service WO2009075535A2 (en)

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