WO2001015446A1 - Procede et dispositif de restitution d'un signal de television numerique - Google Patents
Procede et dispositif de restitution d'un signal de television numerique Download PDFInfo
- Publication number
- WO2001015446A1 WO2001015446A1 PCT/FR2000/002328 FR0002328W WO0115446A1 WO 2001015446 A1 WO2001015446 A1 WO 2001015446A1 FR 0002328 W FR0002328 W FR 0002328W WO 0115446 A1 WO0115446 A1 WO 0115446A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- receiver
- module
- components
- scrambled
- signal
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000006870 function Effects 0.000 claims abstract description 9
- 230000011664 signaling Effects 0.000 claims description 5
- 238000009877 rendering Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 claims description 2
- 230000009897 systematic effect Effects 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015654 memory Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001824 photoionisation detection Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/43607—Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
- H04N21/8355—Generation of protective data, e.g. certificates involving usage data, e.g. number of copies or viewings allowed
-
- 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
Definitions
- the present invention relates to methods and devices for rendering a clear digital television signal from a scrambled signal containing at least both the video and audio components and the messages making it possible to recover a control word necessary for descrambling. .
- the receiver 10 has a physical interface 13 for receiving a module 12.
- This module is controlled by a microprocessor 14 which is in communication with a microprocessor 16 of the receiver through a control link 48 of the control interface 13.
- the receiver can thus indicate to the module 12 which program has been selected by the user, for example from the program identifier and PIDs for the “packet identifier” and transmitting the access control descriptors relating to these components to it.
- the receiver also provides the module with the entire transport stream transmitted by the network, on the channel tuned in at this time. The module can then, using its digital filter 18, select the access control messages relating to this program.
- the module returns to the receiver the transport stream received, but in which the transport packets of the components of the program (s) selected by the user are in clear (descrambled) format.
- the stream is received by the demultiplexer 24 which filters and distributes according to their nature (audio, video, data) the various selected components which it has received in clear.
- the receiver 10 although having a DVB-CI interface, generally comprises an additional circuit 26 making it possible to bypass the module and an integrated DVB descrambler 28 and this because the receiver generally processes at least one system of integrated access control (practically free, whereas an access control module is necessarily expensive due to its material constitution).
- DVB-CI compliant access control modules do not meet this requirement because the selected program components all appear in plain text on the physical interface.
- the invention proposes, in order to remedy this defect, a method of restoring a digital television program signal in the clear from a scrambled signal according to which the demodulated, scrambled signal is transferred and containing messages for obtaining a control word, from a television receiver performing the demodulation and decoding functions to an access control module via a physical interface, characterized in that, at less in a particular operating mode, the signal received from the access control module is retransferred to the receiver with at least, in the scrambled state, one of the components of the selected program, together with the corresponding control words , calculated by the module, and in that the complementary descrambling is carried out in the receiver.
- the invention remedies the above-mentioned defect, essentially by a simple software modification of both the decoder and the module on existing receivers already having a descrambler; this will allow a very economical update of the fleet already in place, insofar as the receiver and the module can be downloaded through the broadcasting network. If in the future the descrambler is not provided for on all receivers, the presence or addition of such a descrambler will be necessary.
- the invention also proposes an access control module intended to be connected by a physical interface to a digital television receiver ensuring demodulation and decoding functions, said module comprising means for recovering control words from '' a stream received from the receiver, means for descrambling of components of the stream and for restoring descrambled components to the receiver, characterized in that the descrambling means are provided for, in response to an instruction contained in the stream, to restore one every month components to the receiver in scrambled form and transfer to the receiver the control words associated with this scrambling.
- a receiver making it possible to implement the above method, comprising a descrambler and a physical interface for demodulated scrambled signal output to an access control and signal return module from the module, the descrambler being provided to descramble at least one of the components of the signal, returned still scrambled by the module, by using a control word transmitted by the module.
- the method involves no longer descrambling in this module at least the video component of the program (s) selected when they are subject to the copyright requirement.
- a variant consists in generalizing the behavior to all of the programs, whether or not they are subject to copyright.
- the module continues, as in the current situation, to carry out all of the functions related to access control (acquisition and processing of access title management messages or EMM, acquisition and decryption of access title control messages or ECM, possible descrambling of components Certainly descrambling of certain components.
- the module allows this or these components to pass transparently but then transmits to the microprocessor of the receiver the control words which it will have deciphered and which relate to this or these components.
- Control words can be transmitted in clear because the level of security required is not very high; they can also be encrypted from a shared secret shared between the module and the receiver, developed for example according to the Diffie-Hellman principle.
- the receiver can in particular be a decoder receiver which includes a DVB type descrambler; it can then simply, while not embedding any other specificity linked to the type of access control used, descramble the component or components of the program transmitted transparently by the module. The indication that the transport packets of the components concerned are scrambled will be provided to the receiver by the headers of these packets.
- scrambling is carried out at the level of so-called PES packets in the MPEG standard.
- the fields containing the information are the "PES scrambling control" in the PES headers.
- a specific signal is transmitted in the digital stream making it possible to distinguish the works (events in the MPEG or DVB sense) protected by copyright or more generally those for which it is contractually obligated not to transfer them in clear by a physical interface.
- One possibility is already provided by the MPEG2 standard at the level of the headers of PES which include a bit of copyright. It can be used, but in general we will prefer signaling in the SI / PSI service identifiers whose access will be easier by the microprocessor of the receiver. Many solutions are possible. Standardization of this signaling is advantageous. It can be provided by introducing an identifier constituting a copyright descriptor in the program definition tables, known as the Program Map Table or PMT.
- the receiver When selecting a program by the user, the receiver, which systematically accesses the PMT, will determine, depending on the presence or not of this descriptor, whether it should enter copyright mode or not. In if so, it gives this information to the module during the transmission of the command containing the partial program definition table ca_pmt which will integrate, in addition in this case, the copyright descriptor.
- the identification by the receiver of a module suitable for the mode will be done, during the initialization of the module by the response to the request for listing of resources, called the "Profile Inquiry" command.
- the module responds by listing the resources it contains.
- a suitable access control module will respond by adding, to the current access control resource (class 3, type 1), the “copyright mode” resource which will be qualified, for example, as class 4 typical.
- FIG. 1 is a diagram of the elements of a decoder and of a module concerned by the invention; and fig. 2 shows a variant.
- the receiver 10 shown in FIG. 1 has a known material constitution. It comprises an input tuner 30 which receives the radio frequency signal and supplies a demodulator 32 supplying the scrambled stream as output. This flow arrives on the one hand at the interface 13 and possibly at the descrambler 28.
- the descrambler 28 is transparent and is limited to transmitting the descrambled stream, received from module 12 on link 40 of the interface, to demultiplexer 24 which directs the data to the microprocessor host 16 associated with working random access memories 34 and non-volatile program 36 and directs the packets containing the video and audio information towards the decoder 38, of MPEG type for example.
- the descrambler 20 of the module 12 is controlled by the microprocessor 14 so as to transmit at least one of the components in scrambled form on the link 40.
- the software necessary for this operating mode if it is not 'is not originally provided, can be downloaded, for example in memory 36 and in a flash memory 42 of the module 12.
- the module 12 comprises both a descrambler 44 of type X and a scrambler 46 of type DVB by which will transit, after descrambling X, the component or components subject to copyright.
- the “transport scrambling control” field of the header of the transport packets is repositioned in the “scrambled” state and the control words necessary for descrambling DVB of this or these components, by the receiver are transmitted to it by the protocol described above.
- the necessary control messages are also transmitted between the module 12 and the receiver by the link 48 of the interface 13.
- Creating local or transmitting control words over the network is a choice for the designer of the access control system and / or module. These may be locally developed hazards, possibly constant throughout the event. They can be derived from the control words necessary for descrambling X, or even be transmitted by private messages from the access control system in the stream broadcast on the network.
- the invention is susceptible of numerous other embodiments as well.
- the nature of the interface can be either parallel, as in the case of DVB Cl, or fast serial, as in the case of the IEEE 1394 type.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU70136/00A AU7013600A (en) | 1999-08-20 | 2000-08-17 | Method and device for restoring a digital television signal |
EP00958694A EP1205070A1 (fr) | 1999-08-20 | 2000-08-17 | Procede et dispositif de restitution d'un signal de television numerique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR99/10674 | 1999-08-20 | ||
FR9910674A FR2797735B1 (fr) | 1999-08-20 | 1999-08-20 | Procede et dispositif de restitution d'un signal de television numerique |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001015446A1 true WO2001015446A1 (fr) | 2001-03-01 |
Family
ID=9549266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2000/002328 WO2001015446A1 (fr) | 1999-08-20 | 2000-08-17 | Procede et dispositif de restitution d'un signal de television numerique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1205070A1 (fr) |
AU (1) | AU7013600A (fr) |
FR (1) | FR2797735B1 (fr) |
WO (1) | WO2001015446A1 (fr) |
-
1999
- 1999-08-20 FR FR9910674A patent/FR2797735B1/fr not_active Expired - Fee Related
-
2000
- 2000-08-17 AU AU70136/00A patent/AU7013600A/en not_active Abandoned
- 2000-08-17 WO PCT/FR2000/002328 patent/WO2001015446A1/fr not_active Application Discontinuation
- 2000-08-17 EP EP00958694A patent/EP1205070A1/fr not_active Withdrawn
Non-Patent Citations (4)
Title |
---|
"FUNCTIONAL MODEL OF A CONDITIONAL ACCESS SYSTEM", EBU REVIEW- TECHNICAL,BE,EUROPEAN BROADCASTING UNION. BRUSSELS, no. 266, 21 December 1995 (1995-12-21), pages 64 - 77, XP000559450, ISSN: 0251-0936 * |
BUER M ET AL: "INTEGRATED SECURITY FOR DIGITAL VIDEO BROADCAST", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS,US,IEEE INC. NEW YORK, vol. 42, no. 3, 1 August 1996 (1996-08-01), pages 500 - 503, XP000638531, ISSN: 0098-3063 * |
CUTTS D J: "DVB CONDITIONAL ACCESS", ELECTRONICS AND COMMUNICATION ENGINEERING JOURNAL,GB,INSTITUTION OF ELECTRICAL ENGINEERS, LONDON, vol. 9, no. 1, 1 February 1997 (1997-02-01), pages 21 - 27, XP000722905, ISSN: 0954-0695 * |
ENGELKAMP H: "HARD- UND SOFTWARE DER SET-TOP-BOXEN", RADIO FERNSEHEN ELEKTRONIK,DE,VEB VERLAG TECHNIK. BERLIN, vol. 45, no. 8, 1 August 1996 (1996-08-01), pages 20 - 23, XP000623888, ISSN: 1436-1574 * |
Also Published As
Publication number | Publication date |
---|---|
AU7013600A (en) | 2001-03-19 |
FR2797735B1 (fr) | 2001-10-26 |
EP1205070A1 (fr) | 2002-05-15 |
FR2797735A1 (fr) | 2001-02-23 |
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