EP1627528A2 - Procede pour la distribution de sequences video, decodeur et systeme pour la mise en oeuvre de ce procede - Google Patents
Procede pour la distribution de sequences video, decodeur et systeme pour la mise en oeuvre de ce procedeInfo
- Publication number
- EP1627528A2 EP1627528A2 EP04702358A EP04702358A EP1627528A2 EP 1627528 A2 EP1627528 A2 EP 1627528A2 EP 04702358 A EP04702358 A EP 04702358A EP 04702358 A EP04702358 A EP 04702358A EP 1627528 A2 EP1627528 A2 EP 1627528A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- personal computer
- video
- decoder
- stream
- main digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000012545 processing Methods 0.000 claims abstract description 30
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims description 12
- 230000000295 complement effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—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
- H04N21/44055—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 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
- H04N21/23473—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by pre-encrypting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
- H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
-
- 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
- H04N21/25875—Management of end-user data involving end-user authentication
-
- 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
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/4143—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a Personal Computer [PC]
-
- 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
- H04N21/4184—External card to be used in combination with the client device, e.g. for conditional access providing storage capabilities, e.g. memory stick
-
- 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
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4334—Recording operations
-
- 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
- H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
-
- 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
- H04N21/65—Transmission of management data between client and server
- H04N21/658—Transmission by the client directed to the server
- H04N21/6581—Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application
-
- 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
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17318—Direct or substantially direct transmission and handling of requests
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/781—Television signal recording using magnetic recording on disks or drums
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
Definitions
- the present invention relates to the field of secure distribution of video sequences.
- a technique for securing a video sequence consists in altering, at the time of broadcasting, the digital video stream so that it is compatible with standard formats and can be recognized by playback equipment, but cannot be viewed in l in a satisfactory condition for a recipient. Additional information is transmitted via a separate channel. The combination of the main digital stream and this additional information only allows the viewing of the initial video sequence.
- the user has a decoder receiving said main digital stream, also called modified video stream, as well as the additional information.
- This decoder must have a mass storage means to provide a buffer between the incoming stream, which may be limited by the speed of the link between the decoder and the network, and the video processor ensuring the reconstruction. It is therefore relatively expensive equipment, limiting the possibilities of broadcasting sequences using this technique.
- the object of the invention is to respond to this problem by allowing the implementation of a simplified decoder, while guaranteeing great security against piracy.
- the invention relates, in its most general sense, to a method for the distribution of video sequences consisting in broadcasting a main digital stream and additional information necessary for the visualization of the video sequence, and to reconstruct on the reception site the video stream which can be viewed on a device provided with a screen, characterized in that the reception site comprises a personal computer comprising a high-speed link and storage means mass, and a video processing peripheral provided with means of communication with said personal computer and of transmission of the viewable stream to a display device, the main digital stream being received by said personal computer, the software application for reconstruction of the stream display being executed in the video processing device and not in the personal computer.
- the main digital stream is transmitted by the server via a digital network, the personal computer (1) comprising a high-speed link for receiving said main digital stream.
- the main digital stream is transmitted by the server via a hardware medium, the personal computer (1) comprising a reader for using said hardware medium and reading said main digital stream.
- the complementary is received by the personal computer, the main digital stream and the complementary information being transmitted by the main computer to the video processing peripheral.
- the additional information is received by the video processing device, the main digital stream being transmitted by the main computer to the video processing device.
- the additional information and the main digital stream are received by the video processing device, the main digital stream being transmitted by the video processing device to the main computer for recording in its mass memory so that it can be replayed later.
- the main digital stream conforms to the norm or standard of the original video stream.
- the personal computer includes a routing module for additional information between the server and the video processing device of the decoder.
- authentication is carried out between the video server and the video processing peripheral of the decoder during the request for additional information, the information relating to said authentication passing by way of the personal computer.
- authentication is carried out between the video server and the video processing peripheral of the decoder during the request for additional information, the information relating to said authentication passing through the personal computer.
- the invention also relates to a decoder comprising an input for receiving a digital stream coming from a personal computer, a video processing circuit for reconstructing a stream which can be viewed from said digital stream and additional information, and an output delivering a signal.
- video displayable on a display device Preferably, the decoder is devoid of hard disk, and more particularly is devoid of means for storing the digital stream and the video stream.
- the decoder comprises a means of communication with a network for the reception of the additional information.
- a personal computer for receiving the additional information.
- the decoder comprises a smart card reader.
- the additional information is recorded in the memory of said smart card.
- it comprises means of wireless communication with a personal computer, for the reception of the digital stream.
- the present invention also describes a system for implementing the method comprising a decoder, a personal computer, the personal computer comprising a disc player on which the main digital streams are recorded and the decoder comprising means of communication with the personal computer, to receive the main digital stream.
- FIG. 2 shows a first variant of a decoder according to the invention
- FIG. 3 shows a second variant of a decoder according to the invention.
- each user must have two complementary equipment: - an unmodified personal computer (1),
- the decoder (2) has an output for connecting at least one display device, for example a monitor, a video projector or a television screen type device (6).
- the decoder (2) mainly comprises, on the one hand, a processing unit suitable for processing, in particular decoding and descrambling any digital video stream, for example of the MPEG type according to a preloaded decoding and descrambling software program, of so as to display it, in real time and, on the other hand, at least one screen interface (7).
- the decoder is also connected to a computer (1) by one or more wired links, for example of the Ethernet, FIREWIRE or USB-2 type, or by one of the wireless links, for example of the Bluetooth, WiFi or AirPort type.
- the link (3) routes the additional information, and the link (4) routes the video stream modified by the server to make it unusable as it is.
- the link (3) is merged with the link (4).
- the user of the decoder (2) wants to view the audiovisual program on his screen (6), he requests it from the synthesis system (8) with his remote control as he would with a video recorder or a DVD player presenting a menu on its television screen (6).
- the decoder dialogues with the computer (1) to trigger the sending of the modified video stream.
- the synthesis system (8) begins to analyze the modified digital stream coming from the hard disk (10) of the computer via the read buffer (11) of the computer.
- the computer (1) then establishes a connection with the video server via the telecommunications network (12) which in our example is a DSL type link.
- the hard disk (10) of the computer (1) can be used as a buffer memory for temporarily storing at least part of the program or of the video sequence to be displayed, in the event of delayed viewing or of limitation in the network bandwidth transmission (12). Viewing can be delayed or delayed at the request of the user or the video server.
- connection interface (5) of the computer (1) is connected to a broadband transmission and broadcasting network (12) such as a modem, a satellite modem, a cable modem , a fiber optic line interface or a radio or infrared interface for wireless communication.
- a broadband transmission and broadcasting network (12) such as a modem, a satellite modem, a cable modem , a fiber optic line interface or a radio or infrared interface for wireless communication.
- this small part of the audiovisual content also called additional information, stored in the server will also be sent to the interface module (15) via the telecommunications network (13) which can be the same network as that of broadband transmission and broadcasting (12).
- the module (15) comprises a routing function (14) making it possible to transfer the data between the video server and the decoder (2) of so that no specific processing on said data is carried out by the computer (1).
- MPEG Since the successive images of a video sequence contain a large number of identical visual elements (as in cinema, an image resembles the previous one), MPEG only records elements that differ from the original image. For example, and without this example being limiting of the invention, an entire reference image is modified while preserving the DC coefficients of the modifications made in the portal and, for the successive images which depend on this reference image I, there n It is not necessary to make modifications since they will cause the displayed flow to diverge due to the disturbances made to the reference I images. MPEG compression therefore begins, first, by decomposing the image into different square matrices comprising several points or pixels, each having their own colorimetric value. A calculation makes it possible to obtain an average value for each matrix within which each point is now embedded. This treatment generates a pixelation and the appearance of uniform flat areas, where there were shades of tint. The second stage of MPEG compression consists in keeping only the changing elements from one image to another. In the case of an audiovisual type program
- the characteristics of the I images from the video server are not transmitted to the module (5).
- the characteristics can be the DC correlation coefficients contained in the I images.
- the MPEG player (8) of the decoder (2) is a standard MPEG player and is in no way modified or affected by the changes made to the images I.
- connection interface of the computer (1) is connected to an extended telecommunications network, directly or by a local network serving as an access network and consists, for example, of a communication interface.
- subscriber line Analog or digital telephone network, DSL, BLR, GSM, GPRS, UMTS, etc.
- the audio-visual programs are diffused in a traditional way in multicast mode (“broadcast”) via the broadband transmission network (12) of hertzian type, cable, satellite, digital hertzian, DSL, etc.
- Each audiovisual program thus broadcast may or may not be encrypted, and the MPEG-type streams include modifications at the level of certain I images as described above.
- certain audiovisual programs thus modified and incomplete are saved in the hard disk of the computer (1).
- the links remain established and allow the computer (1) to receive via the link (13) the functions and parameters for reordering the modified DC coefficients of the images I.
- the flow main digital from the computer hard drive (1) and additional information from the video server via the link (13) are transmitted by the computer (1) to the decoder (2) via the links (4) respectively and (3).
- the combination of the main digital stream and this additional information only allows the viewing of the initial video sequence.
- the modified DC coefficients of the I images thus transmitted are never saved in the hard disk of the computer (1) because the reconstructed I images are directly displayed on the display screen (6) via the processing carried out by the decoder (2 ) after being processed by the Reader (8) from its volatile local memory (81).
- the modified and / or missing DC coefficients of the I images just transmitted by the video server will be erased from the local volatile memory (81) of the decoder (2).
- the computer (1) or the decoder (2) comprises a chip card reader (9) which will allow the portal to authenticate the user who owns the decoder (2). Authentication is performed between the video server and the video processing device of the decoder when requesting additional information. During this authentication step, the information relating to said authentication passes through the personal computer.
- the smart card for a given MPEG audiovisual content, contains said additional information.
- FIG. 2 represents an alternative embodiment, in which the decoder comprises a modem-type interface module (16) connected to a network (13), for directly receiving the additional information.
- the modified video stream is received as in the previous example from a computer (1) through the link (4).
- FIG. 3 represents an alternative embodiment, in which the decoder also comprises an interface module (11) connected to the network (12) for directly receiving the modified main digital stream via the interface module (15) and the link ( 4ter).
- the modified main digital stream is then also transmitted to the computer (1) through the link (4bis) to be recorded on the hard disk (10).
- the connection (4bis) and the connection (4ter) are combined.
- authentication is carried out between the video server and the video processing peripheral of the decoder when the request for additional information is made. During this authentication step, the information relating to said authentication transits separately from the personal computer.
- the modems (16) and (11) are combined as well as the links to the networks (12) and (13).
- the computer (1) includes a disc player, for example a CD or DVD player, for directly reading main digital streams recorded on discs.
- the main digital streams are recorded beforehand on said disks.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- General Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Graphics (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0300406A FR2849980B1 (fr) | 2003-01-15 | 2003-01-15 | Procede pour la distribution de sequences video, decodeur et systeme pour la mise en oeuvre de ce prodede |
PCT/FR2004/050017 WO2004066627A2 (fr) | 2003-01-15 | 2004-01-15 | Procede pour la distribution de sequences video, decodeur et systeme pour la mise en oeuvre de ce procede |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1627528A2 true EP1627528A2 (fr) | 2006-02-22 |
Family
ID=32524936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04702358A Withdrawn EP1627528A2 (fr) | 2003-01-15 | 2004-01-15 | Procede pour la distribution de sequences video, decodeur et systeme pour la mise en oeuvre de ce procede |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050283811A1 (fr) |
EP (1) | EP1627528A2 (fr) |
FR (1) | FR2849980B1 (fr) |
WO (1) | WO2004066627A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2898458B1 (fr) * | 2006-03-10 | 2008-05-16 | Medialive | Procede pour la distribution securisee de sequences audiovisuelles, decodeur et systeme pour la mise en oeuvre de ce procede |
FR2909507B1 (fr) * | 2006-12-05 | 2009-05-22 | Medialive Sa | Procede et systeme de distribution securisee de donnees audiovisuelles par marquage transactionel |
Citations (1)
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2004
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- 2004-01-15 EP EP04702358A patent/EP1627528A2/fr not_active Withdrawn
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2005
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Also Published As
Publication number | Publication date |
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WO2004066627A3 (fr) | 2006-01-19 |
FR2849980A1 (fr) | 2004-07-16 |
FR2849980B1 (fr) | 2005-04-08 |
US20050283811A1 (en) | 2005-12-22 |
WO2004066627A2 (fr) | 2004-08-05 |
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