GB2419060A - Distributing digital multimedia documents wherein the storage devices are remote from a service provider and user. - Google Patents

Distributing digital multimedia documents wherein the storage devices are remote from a service provider and user. Download PDF

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Publication number
GB2419060A
GB2419060A GB0422554A GB0422554A GB2419060A GB 2419060 A GB2419060 A GB 2419060A GB 0422554 A GB0422554 A GB 0422554A GB 0422554 A GB0422554 A GB 0422554A GB 2419060 A GB2419060 A GB 2419060A
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GB
United Kingdom
Prior art keywords
user
apparatus
digital multimedia
stb
storage devices
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Withdrawn
Application number
GB0422554A
Other versions
GB0422554D0 (en
Inventor
Giuseppe Sbrissa
Andrew Shalkov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SAYEG - MARKETING E CONSULTADORIA Lda
SAYEG MARKETING E CONSULTADORI
Original Assignee
Sayeg Marketing E Consultadori
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 Sayeg Marketing E Consultadori filed Critical Sayeg Marketing E Consultadori
Priority to GB0422554A priority Critical patent/GB2419060A/en
Publication of GB0422554D0 publication Critical patent/GB0422554D0/en
Publication of GB2419060A publication Critical patent/GB2419060A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/426Characteristics of or Internal components of the client
    • H04N21/42684Client identification by a unique number or address, e.g. serial number, MAC address, socket ID
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21Server components or server architectures
    • H04N21/222Secondary servers, e.g. proxy server, cable television Head-end
    • H04N21/2221Secondary servers, e.g. proxy server, cable television Head-end being a cable television head-end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2347Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25Management 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
    • H04N21/258Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
    • H04N21/25866Management of end-user data
    • H04N21/25875Management of end-user data involving end-user authentication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/44Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6156Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6187Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a telephone network, e.g. POTS
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/63Control 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
    • H04N21/64Addressing
    • H04N21/6408Unicasting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835Generation of protective data, e.g. certificates
    • H04N21/8358Generation of protective data, e.g. certificates involving watermark
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/173Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309Transmission or handling of upstream communications
    • H04N7/17318Direct or substantially direct transmission and handling of requests
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/173Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309Transmission or handling of upstream communications
    • H04N7/17336Handling of requests in head-ends

Description

APPARATUS FOR DISTRIBUTING

DIGITAL MULTIMEDIA DOCUMENTS

This invention relates to apparatus for distributing digital multimedia documents. More especially but not exclusively, the present invention relates to apparatus for distributing a large number of digital media documents, for example for use by a large number of users over a wide geographical area.

Video on demand enables a user to watch what the user wants and when the user wants to watch. Video on demand services are becoming increasingly popular for users wishing to control their viewing of media content. Viewers wish to avoid the constraints of broadcast services such as conventional television, satellite services and cable television services.

There are a number of problems for companies wishing to offer video on demand services.

The multimedia content demanded by a user is stored on a server.

There are two existing techniques for using such a server. The first known technique is to locate the server centrally and to use a network to deliver the requested multimedia content to the user. A disadvantage of this architecture is that the network has to have a very large capacity, which is increased as the number of subscribers increases. Such a network could be a specialist network, for example a fibre optic network. If this is the case, a very substantial investment must be made to ensure consistent and adequate capacity of the network to be able to deliver the image quality expected by a user over a wide geographical area. Furthermore, the capacity of the network, together with its associated investment must be adequate to support peak demands, for example during a world cup football final.

The second known technique is to use a public network which is able to incorporate the Internet. This solution has a disadvantage in that the capacity of the network is variable, and unlikely to be adequate especially at peak viewing times, to support the demands of the users, thereby leading to a degradation of service.

Video on demand services exist where a receiver is placed in a home, and received by satellite multimedia content which may be viewed on demand by a user. Such services, sometimes called download and play, have significant disadvantage for the owners of the multimedia content.

This is because the multimedia content is typically stored on a hard disc storage device in the premises of the user, and is consequently susceptible to unauthorized copying.

It is an aim of the present invention to obviate to reduce the above mentioned problems.

Accordingly, in one non-limiting embodiment of the present invention there is provided apparatus for distributing digital multimedia documents, which apparatus comprises storage devices which are remote from a service provider and a location of the user and in which the digital multimedia documents are stored, the storage devices being such that they are able to receive the digital multimedia documents by satellite, and the apparatus being such that a user is able to be connected from the user's location to at least one of the storage devices.

The apparatus of the present invention is thus such that it enables the distribution of digital multimedia documents to users over a wide geographical area using transmission by satellite to remote receivers located adjacent to servers where the multimedia documents are stored.

The multimedia documents can be accessed by users remotely from their premises with a simple device which is connected to the server, for example by a conventional telephone connection such for example as a conventional telephone cable.

The apparatus of the present invention may include a point to point connection with the user for enabling the apparatus to track each digital multimedia document and to use dynamic encryption to prevent violation of the apparatus.

The apparatus may include marker means for watermarking each digital multimedia document to identify which user device is associated with an attempted violation of the apparatus.

The apparatus of the present invention may be such that in each major building block of a DTV platform, the architecture of the apparatus is designed to ensure security and integrity of content, whilst delivering the required user experience. The apparatus may be such that it provides the following unique and key differentiators of the DTV system architecture, incorporated as design objectives from the conception of the platform.

the topology of the physical connection of the user's STB to the platform may be point to point rather than the commonly shared network. This singular characteristic gives a fundamental systematic security feature. Users are physically Identified and they may be in a physically closed point to point connection with a DTV edge server.

full time unicast network delivery may be provided of the video stream to each STB for both VOD and live channels. Communication between each STB and DTV servers may be by TCP/IP unicast encrypted connection. Each video session may be encoded on the fly-by DTV edge server using a one-time encryption key. There may be continuous logging of the STB activity.

a watermark may be invisibly embedded into an analog signal generated by the STB so that it contains each STB's unique identity, allowing identification of the STB used to create an illegal copy. This may enable the DTV to identity a violator of the apparatus and to possess physical evidence for legal proceedings.

An embodiment of the invention will now be described solely by way of example and with reference to the accompany drawings in which: Figure 1 shows schematically the overall apparatus; and Figure 2 shows in more detail part of the apparatus shown in Figure 1. s

Referring to Figure 1, there is shown encoding at source 1, and live channels 2. A lease line shown connected to the source 1. Also shown in Figure 1 are acquisition 3, encoding 4, storage 5 and delivery 6.

A DTV delivery full transponder 7 has protected bandwidth. The apparatus also comprises a DTV edge server 8, a DSI AM 9, a ADSL, and a DTV STB 10.

The content acquisition 3 is such that the apparatus of the invention uses advanced technology for real time encoding of live channels and off- line encoding of VOD content. This permits delivery of programs to a user with a high image quality using minimal bandwidth to reduce cost. The content acquisition 3 is effected by encoding or compression.

The live channels 2 are either received by; satellite 2 at head office, decoded and re-encoded.

encoded at the site of the source 1 and transmitted in an encoded format over a leased line to the apparatus head office. This option delivers a higher image quality, avoiding one generation of compression.

The VOD source materials may be such that content is received on physical media normally as beta format based media, including digibeta or beta SP tapes/discs.

The digital storage 5 may be a state of the art hierarchical storage system.

The delivery 6 is security based on a unicast topology More specifically, each user is physically connected to the appropriate equipment in the apparatus with a cable. This individual connection to each user is expanded in the communication architecture of the apparatus, to become a matrix with each user being managed individually. This contrasts with network based solutions commonly used by broadcasters. This fundamental feature, combined with state of the art security software components at application levels, ensures that the apparatus offers a level of security that cannot be achieved by other delivery technologies such as cable or satellite broadcast systems.

Headquarter apparatus delivery 7 to edge servers 8 may use protected bandwidth through a dedicated satellite transponder. With this technology, spatial transfers are protected by dedicated radio modulation and cannot be received by a common satellite receiver. Encryption of video streams and management data introduces a further barrier to system violation. The apparatus network is closed with no point for third part access.

The edge servers 8 may be units of edge servers which may have been custom engineered to deliver only unicast TOP video on demand and live streams over controlled direct connections.

Referring to Figure 2, there is shown the edge server 8, the DSLAM 9, the ADSL copper line, and the apparatus STB 10. Also shown are a route server A and steam servers B. An edge server unit 8 comprises two types of server and a DSLAM.

One route server (A) the route server has two primary functions. The first function is satellite data reception, decryption, routing. The second function is serving the local user's database (authentication/profiling/program licenses) to the stream servers (B). The route server is connected to "protected bandwidth" satellite receiver and to the stream servers (B) with a closed LAN.

Two or more stream servers (B) Stream servers are dedicated to serving video. They do not contain user information. They send requests to the route server (A) to get user authentication, user authorization and permission to generate one time encryption keys and thereafter negotiate encryption keys with STBs.

One live dedicated stream server is used to support up to 200 independent unicast streaming connections. One VOD dedicated server is used to support up to 60 independent unicast streaming connections. More streaming servers can be added if necessary.

If the demand for streams from users exceeds the streaming capacity of the stream servers, the streaming will transparently shift to a multicast delivery during this period.

Stream servers have two network interfaces. One is connected to the route server in a closed LAN. The other is connected by another closed LAN to the DSLAM 9 for sending video streams onward to the STBs.

The DSLAMs 9 are engineered to the specification requirements of the apparatus. The DSLAMs 9 are optimised for performance and security to deliver adequate bandwidth on the last mile to ensure that even with 100% contemporaneous usage, image quality is retained.

The user physical line, for example DSLAM port number, is identified and checked against the STB unique identity before starting a video streaming session.

The edge server of the apparatus uses software features to create an encryption interface which prevents access to video content. It is impossible to access unencrypted video content on the edge server 8.

Edae Servers 8 to DTV STB 10 The apparatus platform has been designed to make access to an edge server 8 with a non-authorised device exceptionally difficult.

each STB connected with ADSL has a physical and direct and private connection to the DSLAM through the copper telephone cable.

the edge server monitors the fact that an installed STB does not change because the edge servers have access to the Mac address, STB unique identity, and DSLAM port number used by the STB From a user connection, route server (A) which holds part of the user data is highly protected by network topology.

having the opportunity to try and steal data from the route server (A) would imply having access from a user connection to the route server.

route server (A) lies on a second network. Having access to a route server (A) would imply breaching stream server's (B) security and gaining privileged access to a stream server on a third network to access the second network.

having access from a user connection to the stream server (B) would imply being able to emulate totally the STB network behaviour with another device to be accepted on the third network.

Unwarranted access to the route server is further inhibited by the fact that the connection to the streaming server is for streaming and the principle access is via the back-end satellite connection.

Delivery application level securing involves STB identification and authentication 10. As well as the Mac Address and DSLAM port number, each STB 10 has a unique hardware feature burned into the apparatus.

This identifier is unique and non-modifiable. When powered up, a STB 10 will start a registration procedure on its edge server before proceeding.

With regard to data transfers encryption, at application level every transmission of sensitive information is protected using standard SSL/RSA encryption. For example, hash values of STB unique identification number; one time encryption negotiation between STB and the edge server.

With regard to video session security, the robustness of an encrypted system is directly linked to the robustness of its key distribution method.

Consequently, the apparatus of the present invention concentrates on systematic features rather than for example on refining an encryption algorithm. Conventional subscriber broadcasters (cable or satellite) use the same encrypted signal to all subscribers. If one subscriber breaks the access code, the whole system is vulnerable. The apparatus security is systemically hostile for the violator, and there is no one key giving access to more than one video session to one user.

video stream security is based on using a one time encryption key for each VOD session, for example per user video and TCP/IP session.

the one-time keys for each video session are generated in the edge servers 8 system by the stream server (A) which obtain data (profile, authorization, validation licences for program viewing) from the route server (A) and instigate the necessary checking procedures.

one-time keys are transmitted over ADSL lines and the apparatus private network using SSL/RSA encryption.

the VOD streams are encrypted "on the flyer" by the stream servers and transmitted over the ADSL network in encrypted form only. The VOD stream received by the user's STB is unique and can only be decrypted on the specific STB if the STB has the one-time key corresponding to the specific VOD stream. The STB analogue copy protection 10 is such that its architecture does not permit analogue video recording. The analogue output of the STB support Macrovision 7.02 analogue copy protection.

The STB analogue watermarking 10 has the ability to add hidden information to the analogue video signal. Watermarks are individual for each STB and enable DTV to find the unique identity of the STB which generated the analogue output for an illegal copy. This feature enables the apparatus to identify violators and produce physical evidence for legal proceedings.

The architecture of the STB digital copy protection 10 does not allow stream recording. The STB does not include a hard disk drive, or other high capacity device allowing stream recording. The STB has a network connection and uses two USB ports. Both the USB ports and the network connection are disabled. The amount of storage devices used in STB (RAM 128 Mb and FlashRom 32 Mb) is not sufficient to store VOD streams.

The STB hardware protection incorporates an intruder detection system (hardware circuit for detecting opening of the STB cover) that alerts technical personnel of the apparatus in the case of opening of the protective cover. If a user opens their STB, the STB, when connected again to the service, will send the message containing its unique identity to the apparatus headquarter.

With regard to session and event logging, every authentication and one time key negotiation with each STB is logged by the authentication and security servers. All STB activity can be logged by the edge servers 8 including VOD events and zapping, enabling the apparatus to analyse every session of a single STB and track system abuse attempts.

It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawings has been given by way of example only and that modifications may be effected.

Claims (5)

1. Apparatus for distributing digital multimedia documents, which apparatus comprises storage devices which are remote from a service provider and a location of the user and in which the digital multimedia documents are stored, the storage devices being such that they are able to receive the digital multimedia documents by satellite, and the apparatus being such that a user is able to be connected from the user's location to at least one of the storage devices.
2. Apparatus according to claim 1 in which the user is able to be connected from the user's location to at least one of the storage devices by a conventional telephone cable
3. Apparatus according to claim 1 or claim 2 and including a point to point connection with the user for enabling the apparatus to track each digital multimedia document and to use dynamic encryption to prevent violation of the apparatus.
4. Apparatus according to any one of the preceding claims and including marker means for watermarking each digital multimedia document to identify which user device is associated with an attempted violation of the apparatus.
5. Apparatus for distributing digital multimedia documents, substantially as herein described with reference to the accompanying drawings.
GB0422554A 2004-10-11 2004-10-11 Distributing digital multimedia documents wherein the storage devices are remote from a service provider and user. Withdrawn GB2419060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0422554A GB2419060A (en) 2004-10-11 2004-10-11 Distributing digital multimedia documents wherein the storage devices are remote from a service provider and user.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0422554A GB2419060A (en) 2004-10-11 2004-10-11 Distributing digital multimedia documents wherein the storage devices are remote from a service provider and user.

Publications (2)

Publication Number Publication Date
GB0422554D0 GB0422554D0 (en) 2004-11-10
GB2419060A true GB2419060A (en) 2006-04-12

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Application Number Title Priority Date Filing Date
GB0422554A Withdrawn GB2419060A (en) 2004-10-11 2004-10-11 Distributing digital multimedia documents wherein the storage devices are remote from a service provider and user.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2104348A3 (en) * 2008-02-25 2013-09-18 Globecomm Systems, Inc. Virtual IPTV-VOD system with remote satellite reception of satellite delivered VOD content and method of providing same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2301269A (en) * 1995-05-08 1996-11-27 Video Jukebox Network Inc Distributing compressed digital video to subscriber group with preferences.
WO1999065244A1 (en) * 1998-06-11 1999-12-16 United Video Properties, Inc. Interactive television program guide with on-demand data supplementation
US6182218B1 (en) * 1994-12-13 2001-01-30 Mitsubishi Corporation Digital content management system using electronic watermark
EP1195998A1 (en) * 2000-09-21 2002-04-10 Command Audio Corporation Distributed media on-demand information service
WO2002031701A2 (en) * 2000-10-11 2002-04-18 United Video Properties, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
EP1420591A1 (en) * 1998-12-23 2004-05-19 NTL Group Limited Electronic programme scheduling system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6182218B1 (en) * 1994-12-13 2001-01-30 Mitsubishi Corporation Digital content management system using electronic watermark
GB2301269A (en) * 1995-05-08 1996-11-27 Video Jukebox Network Inc Distributing compressed digital video to subscriber group with preferences.
WO1999065244A1 (en) * 1998-06-11 1999-12-16 United Video Properties, Inc. Interactive television program guide with on-demand data supplementation
EP1420591A1 (en) * 1998-12-23 2004-05-19 NTL Group Limited Electronic programme scheduling system
EP1195998A1 (en) * 2000-09-21 2002-04-10 Command Audio Corporation Distributed media on-demand information service
WO2002031701A2 (en) * 2000-10-11 2002-04-18 United Video Properties, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2104348A3 (en) * 2008-02-25 2013-09-18 Globecomm Systems, Inc. Virtual IPTV-VOD system with remote satellite reception of satellite delivered VOD content and method of providing same

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