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]
  • H04N21/40—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]
  • H04N21/20—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
  • H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
  • H04N21/25866—Management of end-user data
  • H04N21/25891—Management of end-user data being end-user preferences
• • 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]
• • 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
  • H04N21/47—End-user applications
  • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
  • H04N21/47211—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting pay-per-view content
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
  • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
  • H04N21/633—Control signals issued by server directed to the network components or client
  • H04N21/6332—Control signals issued by server directed to the network components or client directed to client
  • H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
  • H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/16—Analogue secrecy systems; Analogue subscription systems
  • H04N7/162—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
  • 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
  • H04N7/165—Centralised control of user terminal ; Registering at central
• • 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

Definitions

• the present invention relates to an access control method in the field of digital pay television.
• the techniques used in pay television are based on two independent mechanisms: on the one hand on a scrambling / encryption of the video and / or audio signals, on the other hand on a function of allocation of commercial rights which are transmitted as secure messages a descrambling unit (with control access).
• Encryption can be easily applied to a digital bit stream. All bits can be encrypted using, for example, block encryption. Interference is used for analog broadcasts. By using such scrambling the signal format is changed, the synchronization signals are suppressed and transmitted separately in encrypted form.
• the audio signal can be converted to a digital signal and then encrypted.
• the encrypted digital audio signal can be inserted into the video signal.
• the transmitted data is scrambled or encrypted using a control word (CW) or a key.
• the control word or • key changes after a short period.
• ECM Entitlement Control Messages
• EMM Entitlement Management Messages
• ECM and EMM can be sent through the receiving station subscribed to a smart card.
• ECM messages contain information that allows the subscriber receiving station to manage the video and / or audio signals. Unscrambling data is returned to it in a form that allows scrambling only if the user is authorized to access the current television program.
• entitlement data When a user is represented by a smart card, access authorization is indicated by entitlement data stored in the card.
• EMM messages contain information which makes it possible to update the rights allocation data of the user, for example by modifying the data stored in the smart card.
• ECM and EMM messages have a digital signature field which ensures the integrity of the message (for example a hash code). This prevents users from being able to modify the content of their messages.
• An ECM message is sent with the scrambled signal transmitted. It includes three fields.
• the first field contains the access parameters. These parameters define the conditions under which access to a television program is permitted. This field makes, for example, possible a parental assessment (an additional PIN code is then required by the decoder) and a geographic blackout (a film may not be available in all European countries).
• the second field contains a control word in encrypted form.
• the last field contains a data integrity check.
• An EMM message usually contains four fields. Each EMM message begins with an address field to select a receiver (s). There are two addressing modes, one for an individual station and the other for a group of such stations. The second field contains an allocation of rights for a given user. The third field contains the service keys in encrypted form. The last field contains a data integrity check. EMM messages can also be used to send a command to the decoder. The emission of EMM messages is generally the result of an explicit request from the user to the service provider. These messages are generally individual. EMM messages are not transmitted synchronously with the television service to which they apply. They are transmitted in advance to allow access to a given program by an authorized user. Any network can be used to transmit these EMM messages to the receiver: modem, mail or broadcasting.
• EMM messages are thus organized cyclically according to a given period for transmission.
• the duration of such a period is the main parameter for determining the maximum time to wait to obtain a right allocation for a user who has shut down his receiving station for a long time.
• conditional access system for use in digital television.
• Such a conditional access system includes a combination of scrambling and encryption to prevent unauthorized reception, the scrambling making images, sound and data unintelligible, the encryption protecting the secret keys which have been transmitted with the scrambled signal to allow the descrambler to operate. After unscrambling, any defect in the images or sound must be imperceptible, that is to say that this conditional access system must be transparent.
• This subscriber authorization system 10 SAS or "Subscriber Authorization System) as well as a control word generator 11 (CW) are connected to an operator transmission station 12, each via an encryption circuit 13 and 1.
• SAS Subscriber Authorization System
• CW control word generator 11
• This operator transmitting station 12 receives image signals I, sound S and data D which pass successively through a multiplexer
• a subscriber reception station 21 On reception of the signals transmitted by said transmitter 18 and transmitted, for example, via a satellite 20, a subscriber reception station 21, which successively comprises a receiver 22, a demodulator 23, a descrambler 24, a demultiplexer 25, delivers image signals I ', sound S', and data D '.
• a conditional access subsystem for example a smart card 26, which includes two decryption circuits 27 and 28 and a security processor 29 (secret keys) is connected to this subscriber reception station 21.
• Scrambling requires having a scrambler, a decryption circuit and a current service key.
• Decryption requires the use of rights allocation management messages (EMM) for the current program, which usually uses secret keys stored in the smart card 26.
• EMM rights allocation management messages
• a consumption mode on demand can be offered to subscribers.
• This consumption mode allows you to view a service, for example a cinema screening, in subscription mode with a reservation of session or "impulsive pay per vie / pay per time" type of operation (payment to see / payment for a certain duration impulsive).
• Such a consumption method does not allow promotional offers to be made directly to a subscriber, nor even to authorize a service in a targeted manner, for example seeing a given program during a certain window of time, depending on the profile of a determined subscriber, so as to target a certain segment of subscriber population, without having to send validation allocation management (EMM) messages then validation.
• EMM validation allocation management
• the object of the invention is to solve such a problem by providing a new mode of consumption making it possible to authorize a service in a targeted and remote manner as a function of a determined subscriber profile, without causing great constraint on the station. operator broadcast.
• the present invention therefore proposes a method of controlling access, in digital pay television, to information contained in a signal received by a subscriber reception station comprising steps: - transmission of two types of messages via this subscriber reception station to a user device, first rights allocation control messages containing information to allow this subscriber reception station to decode the signal and to offer subscribers a mode of operation on demand, second messages from rights allocation management containing information to allow updating of rights allocation data of the user, generation in the user device of an access authorization signal to allow decoding of said signal by the subscriber reception station if the user is authorized to access the information contained therein, characterized in that first rights allocation control messages are sent having a configurable profile content making it possible to authorize at least a service or a program during a certain window of time according to the profile of a determined subscriber, so as to achieve a certain interactivity between the content of these first messages and the content of the user device in terms of subscription for the subscriber .
• EMM rights allocation management messages
• This process makes it possible, in fact, to fight against a certain type of system hacking, which consists for a given subscriber, at a determined time, of requesting a maximum subscription offer then after reception of the rights allocation management message.
• EMM rights allocation management
• the single figure illustrates a transmission-reception system for digital television signals of the known art.
• the ECM rights allocation control messages have a configurable profile content, which makes it possible to achieve a certain interactivity between the content of such ECM messages and the content of the smart card, in terms of subscription for the subscriber.
• Such a characteristic allows viewing of certain services according to the profile of subscribers, without having to. send a large number of EMM rights allocation management messages beforehand. It also allows subscribers with a certain profile to benefit from a reduced price. For example, a subscriber who paid fees for PI and P2 programs and a commercial offer 01 can pay for a program to buy 2 tokens, while other users have to pay for 4 tokens.
• each service or each program is allocated a daily temporary offer.
• a subscriber requests access to a program, for example a cinema screening, rather than giving him access to a permanent offer, he is given access to a temporary offer. So if in a short period of time, for example the same day, this subscriber requests a maximum subscription offer then changes his mind and, in order not to pay, requests to benefit from the basic subscription, usually a message of management of allocation of rights of revocation EMM is sent to him.
• EMM blocker For subscribers who have requested and confirmed their maximum offer, it is however necessary to send a EMM revocation message with the permanent offer of this service, or this program.
• conditional contents of the EMM messages make it possible to work by using functions AND, OR, IF, ELSE and NOT, on the Bitmap fields which represent the geographic addressing and / or the addressing addressing. They also make it possible to carry out a conditional operation between program numbers, for example a purchase of such a program if such another program has already been purchased.
• a conditional operating mode takes the form of a sequence, for example: IF (offer 01) AND (offer 02) AND (NOT offer 03)
• Conditional mechanisms can be used to offer a subscriber additional purchasing or viewing possibilities, for example: IF (((offer 01) AND ((offer 03) OR (offer 04))) OR

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=32338873

Family Applications (1)

Country Status (9)

Families Citing this family (12)

Family Cites Families (3)

• 2002
  • 2002-12-17 FR FR0215978A patent/FR2848764A1/fr active Pending
• 2003
  • 2003-12-16 JP JP2004561580A patent/JP2006510323A/ja active Pending
  • 2003-12-16 CN CNA2003801062217A patent/CN1726714A/zh active Pending
  • 2003-12-16 KR KR1020057011171A patent/KR20050090399A/ko not_active Application Discontinuation
  • 2003-12-16 EP EP03809993A patent/EP1574059A2/de not_active Withdrawn
  • 2003-12-16 MX MXPA05006345A patent/MXPA05006345A/es not_active Application Discontinuation
  • 2003-12-16 AU AU2003302182A patent/AU2003302182A1/en not_active Abandoned
  • 2003-12-16 BR BR0317347-0A patent/BR0317347A/pt not_active IP Right Cessation
  • 2003-12-16 WO PCT/FR2003/050181 patent/WO2004057871A2/fr not_active Application Discontinuation

Non-Patent Citations (1)

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