WO2000054493A1 - Secure distribution of video on-demand - Google Patents

Secure distribution of video on-demand Download PDF

Info

Publication number
WO2000054493A1
WO2000054493A1 PCT/US2000/006480 US0006480W WO0054493A1 WO 2000054493 A1 WO2000054493 A1 WO 2000054493A1 US 0006480 W US0006480 W US 0006480W WO 0054493 A1 WO0054493 A1 WO 0054493A1
Authority
WO
WIPO (PCT)
Prior art keywords
encrypted form
video
set forth
video programming
key
Prior art date
Application number
PCT/US2000/006480
Other languages
French (fr)
Inventor
Yong Ho Son
Christpher Goode
Original Assignee
Diva Systems Corporation
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 Diva Systems Corporation filed Critical Diva Systems Corporation
Priority to AU38789/00A priority Critical patent/AU3878900A/en
Priority to CA002367449A priority patent/CA2367449C/en
Priority to GB0121689A priority patent/GB2363928B/en
Publication of WO2000054493A1 publication Critical patent/WO2000054493A1/en

Links

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
    • H04N21/45Management 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
    • H04N21/454Content or additional data filtering, e.g. blocking advertisements
    • H04N21/4542Blocking scenes or portions of the received content, e.g. censoring scenes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/167Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • 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
    • H04N21/23Processing 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
    • H04N21/23473Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption by pre-encrypting
    • 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
    • H04N21/23476Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • 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
    • H04N21/47End-user applications
    • H04N21/472End-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
    • H04N21/47202End-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 content on demand, e.g. video on demand
    • 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
    • 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

Definitions

  • This invention relates generally to the field of video distribution networks.
  • this invention relates to secure video distribution networks.
  • a first portion where security is of concern is the primary distribution
  • the primary distribution network is where video content is transferred
  • the secondary distribution network is of concern is the secondary distribution network.
  • the secondary distribution network is of concern is the secondary distribution network.
  • the network is where the video content is transmitted from a distribution center to
  • That point is a remote server within a distribution center.
  • a remote server within a distribution center.
  • such a remote server stores the video content before the video
  • the present invention provides a solution to the security issues presented
  • a remote server receives video programming in a
  • first encrypted form and stores the video programming in the first encrypted
  • the remote server After the remote server receives a request from a subscriber station for
  • the remote server decrypts the video
  • a remote server In accordance with a second aspect of the invention, a remote server
  • the remote server After the remote server receives a request from a subscriber station for
  • the remote server simply transmits the
  • a remote server In accordance with a third aspect of the invention, a remote server
  • the remote server After the remote server receives a request from a subscriber station for transmission of the video progra ⁇ uning, the
  • remote server passes through the video content by transmitting the video
  • a remote server In accordance with a fourth aspect of the invention, a remote server
  • the remote server completes
  • Fig. 1 is a schematic diagram of a conventional cable distribution network.
  • Fig. 2 is a flow chart depicting a conventional insecure process for
  • Fig. 3 is a flow chart depicting a conventional (somewhat) secure process
  • Fig. 4 is a schematic diagram of a cable distribution network including a
  • Fig. 5A is a flow chart depicting a secure process for distributing video on-
  • Fig. 5B is a flow chart depicting a secure process for distributing video on-
  • Fig. 6 is a flow chart depicting a secure process for distributing video on-
  • Fig. 7 is a flow chart depicting a secure process for distributing video on-
  • Fig. 1 is a schematic diagram of a conventional cable distribution network.
  • the conventional cable distribution network typically includes one or more
  • broadcast sources 102 one or more premium broadcast sources 104, one or more
  • distribution centers 106 one or more secondary distribution networks 108, and a
  • the broadcast source 102 may be, for example, a local television station.
  • an affiliate station of a major network such as ABC, NBC, CBS,
  • the premium broadcast source 104 may be, for example, a
  • the sources 102 provide a premium channel such as HBO, Showtime, Cinemax, and so on.
  • the distribution center 106 may be, for example, a cable head-end.
  • the distribution center 106 may be coupled via a secondary distribution network 108 to the subscriber stations 110.
  • the secondary distribution network 108 may be coupled via a secondary distribution network 108 to the subscriber stations 110.
  • the secondary distribution network 108 may be coupled via a secondary distribution network 108 to the subscriber stations 110.
  • comprises may include, for example, various amplifiers, bridges, taps, and drop
  • the subscriber stations 110 may be, for example, set- top boxes
  • Fig. 2 is a flow chart depicting a conventional insecure process for
  • non-premium video signal is transported 202 from the broadcast source 102 to
  • the video signal is
  • multiplexed 204 with other signals to generate a multiplexed signal.
  • multiplexed signal is then distributed 206 from the distribution center 106 via the
  • the multiplexed signed is demultiplexed 208 to isolate the
  • the video signal is displayed 210, typically, on a television
  • Fig. 3 is a flow chart depicting a conventional (somewhat) secure process
  • a premium video signal is encrypted 302 to generate an encrypted signal.
  • the encrypted signal is transported 304 from the premium broadcast source 104
  • the video signal is decrypted 306 to
  • the multiplexed signal is then distributed 312 from the distribution
  • the multiplexed signal is demultiplexed 314
  • the scrambled video signal is unscrambled
  • the video signal is displayed 318, typically, on a television monitor
  • Fig. 3 is a typical conventional process
  • Fig. 4 is a schematic diagram of a cable distribution network including a
  • Fig. 4 includes a video on-demand source 402 and a remote server 404.
  • video on-demand source 402 may house, for example, a collection of video
  • the remote server As shown in Fig. 4, the remote server
  • the remote server 404 may be located within the distribution center 106.
  • the remote server 404 may be located within the distribution center 106.
  • the remote server 404 may be located within the distribution center 106.
  • a parallel processing computer configured to be a
  • video server a disk drive array to store video data
  • a video session manager to manage video sessions.
  • Fig. 5A is a flow chart depicting a secure process for distributing video on-
  • Fig. 5 A The process depicted in Fig. 5 A may be called a store
  • a video program is encrypted 502 by a video on-demand source 402
  • program is transported 504 via a primary distribution network from the video
  • on-demand source 402 to a remote server 404 within a distribution center 106.
  • the encrypted program is then stored 506 in the remote server 404.
  • server 404 responds by first decrypting 510 the video program from the first
  • a first key is may be used to accomplish such decryption 510,
  • the remote server 404 After the video program is decrypted 510, the remote server 404
  • the second key may be a public key of a public key encryption system.
  • Such a public key encryption system uses two different key: a public key to
  • the second key may be a private key of a
  • Such a private key encryption system uses a
  • encryption system is encryption under the Data Encryption Standard (DES) or
  • the private key(s) itself may be transmitted from the remote server 404 to the
  • the multiplexed signal is
  • the multiplexed signal is demultiplexed 518
  • the re-encrypted program is decrypted 520 from the
  • video program is displayed 522, typically, on a television monitor connected to
  • Fig. 5B is a flow chart depicting a secure process for distributing video on-
  • Fig. 5B The process depicted in Fig. 5B may be called a
  • a video program is encrypted 502 by a video on-demand source 402
  • program is transported 504 via a primary distribution network from the video
  • on-demand source 402 to a remote server 404 within a distribution center 106.
  • the remote server 510 decrypts 510 the video program from the first
  • a first key is may be used to accomplish such decryption 510,
  • the remote server 404 After the video program is decrypted 510, the remote server 404
  • step 506 in Fig. 5B differs from step 506 in Fig. 5A in that step
  • step 506 in Fig. 5 A involves storing the video program in the first
  • server 404 responds by multiplexing 514 the re-encrypted program in the second
  • the multiplexed signal is then distributed 516 via the
  • the multiplexed signal is demultiplexed 518
  • the re-encrypted program is decrypted 520 from the
  • video program is displayed 522, typically, on a television monitor connected to
  • Fig. 6 is a flow chart depicting a secure process for distributing video on-
  • Fig. 6 The process depicted in Fig. 6 may be called a
  • a video program is encrypted 602 by a video on-demand source 402
  • program is transported 604 via a primary distribution network from the video
  • on-demand source 402 to a remote server 404 within a distribution center 106.
  • key to decrypt the encrypted program may also be transported from the source
  • the key may be a public key of a public key encryption system.
  • a public key of a public key encryption system Such a
  • public key encryption system uses two different key: a public key to encrypt
  • decryption would be accomplished using a corresponding private key of the public key encryption
  • the key may be a private key of a private key
  • Such a private key encryption system uses a single private
  • key(s) itself may be transmitted from the source 402 to the server 404 while
  • the private key(s) may be
  • server 404 responds by multiplexing 610 the encrypted program in the first
  • the multiplexed signal is then distributed 612 via the
  • the multiplexed signal is demultiplexed 614
  • the encrypted program is decrypted 616 from the first encrypted form to generate the unencrypted video program, and then the video program is
  • Fig. 7 is a flow chart depicting a secure process for distributing video on-
  • Fig. 7 The process depicted in Fig. 7 may be called a
  • the pre-encryption step 702 may be implemented by applying a single
  • encryption then the completion of encryption step 704 may be implemented by
  • the video program is transported from the remote server 404 to the

Abstract

A remote server (404) receives encrypted video from a programming source, stores it and decrypts it after receiving a request from a subscriber. Next, the server re-encrypts the video and transmits the newly encrypted video to the subscriber. In a second aspect, a server (404) receives encrypted video, decrypts the originally encrypted video, re-encrypts the video into a second encrypted form and stores the newly encrypted video. When a subscriber requests the video the server will then transmit it to the subscriber. In a third aspect, a server (404) receives encrypted video and stores it. When a subscriber requests the video the server will then transmit the video in its original encrypted form. In a fourth aspect, a server receives pre-encrypted video and stores it. When a subscriber request the video the server will complete encryption of the video before transmitting it to the subscriber.

Description

SECURE DISTRIBUTION OF VIDEO ON-DEMAND
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to the field of video distribution networks.
In particular, this invention relates to secure video distribution networks.
2. Description of the Background Art
Security is an important issue for video distribution networks. For cable
distribution networks, there are various portions or locations where security is of
concern.
A first portion where security is of concern is the primary distribution
network. The primary distribution network is where video content is transferred
from television studios to distribution centers. A second portion where security
is of concern is the secondary distribution network. The secondary distribution
network is where the video content is transmitted from a distribution center to
subscriber stations.
For video on-demand distribution networks, there is an additional point
where security is of concern. That point is a remote server within a distribution center. Typically, such a remote server stores the video content before the video
content is distributed to the subscriber stations.
SUMMARY OF THE INVENTION
The present invention provides a solution to the security issues presented
above, especially with regards to security at a remote server. In accordance with
a first aspect of the invention, a remote server receives video programming in a
first encrypted form and stores the video programming in the first encrypted
form. After the remote server receives a request from a subscriber station for
transmission of the video progr-unming, the remote server decrypts the video
programming, re-encrypts the video programming into a second encrypted
form, and then transmits the video programming in the second encrypted form
to the subscriber station.
In accordance with a second aspect of the invention, a remote server
receives video programming in a first encrypted form, decrypts the video
programming, re-encrypts the video programming into a second encrypted
form, and then stores the video programming in the second encrypted form.
After the remote server receives a request from a subscriber station for
transmission of the video programming, the remote server simply transmits the
video programming in the second encrypted form to the subscriber station.
In accordance with a third aspect of the invention, a remote server
receives video programming in a first encrypted form and stores the video
programming in the first encrypted form. After the remote server receives a request from a subscriber station for transmission of the video prograπuning, the
remote server passes through the video content by transmitting the video
programming in the first encrypted form to the subscriber station.
In accordance with a fourth aspect of the invention, a remote server
receives pre-encrypted video progr-miming and stores the pre-encrypted video
prograrnn ing. After the remote server receives a request from a subscriber
station for transmission of the video programming, the remote server completes
encryption of the video programming and then transmits the video
programming to the subscriber station. At the subscriber station, the video
programming is fully decrypted.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic diagram of a conventional cable distribution network.
Fig. 2 is a flow chart depicting a conventional insecure process for
distributing video content via a conventional cable distribution network.
Fig. 3 is a flow chart depicting a conventional (somewhat) secure process
for distributing video content via a conventional cable distribution network.
Fig. 4 is a schematic diagram of a cable distribution network including a
video on-demand source in accordance with a preferred embodiment of the
present invention.
Fig. 5A is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a first aspect
of the present invention. Fig. 5B is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a second
aspect of the present invention.
Fig. 6 is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a third
aspect of the present invention.
Fig. 7 is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a fourth
aspect of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig. 1 is a schematic diagram of a conventional cable distribution network.
The conventional cable distribution network typically includes one or more
broadcast sources 102, one or more premium broadcast sources 104, one or more
distribution centers 106, one or more secondary distribution networks 108, and a
plurality of subscriber stations 110.
The broadcast source 102 may be, for example, a local television station.
For instance, an affiliate station of a major network such as ABC, NBC, CBS,
FOX, or UPN. The premium broadcast source 104 may be, for example, a
premium channel such as HBO, Showtime, Cinemax, and so on. The sources 102
and 104 may be coupled via a primary distribution network to the distribution
center 106. The distribution center 106 may be, for example, a cable head-end.
The distribution center 106 may be coupled via a secondary distribution network 108 to the subscriber stations 110. The secondary distribution network 108
comprises may include, for example, various amplifiers, bridges, taps, and drop
cables. Finally, the subscriber stations 110 may be, for example, set- top boxes
and associated television equipment for viewing the video content by end users.
Fig. 2 is a flow chart depicting a conventional insecure process for
distributing video content via a conventional cable distribution network. First, a
non-premium video signal is transported 202 from the broadcast source 102 to
the distribution center 106. At the distribution center 106, the video signal is
multiplexed 204 with other signals to generate a multiplexed signal. The
multiplexed signal is then distributed 206 from the distribution center 106 via the
secondary distribution network 108 to the subscriber stations 110. At the
subscriber stations 110, the multiplexed signed is demultiplexed 208 to isolate the
video signal, and then the video signal is displayed 210, typically, on a television
monitor.
Fig. 3 is a flow chart depicting a conventional (somewhat) secure process
for distributing video content via a conventional cable distribution network.
First, a premium video signal is encrypted 302 to generate an encrypted signal.
The encrypted signal is transported 304 from the premium broadcast source 104
to the distribution center 106.
At the distribution center 106, the video signal is decrypted 306 to
regenerate the premium video signal. The premium video signal is then
scrambled 308 and multiplexed 310 with other signals to generate a multiplexed signal. The multiplexed signal is then distributed 312 from the distribution
center 106 via the secondary distribution network 108 to the subscriber stations
110.
At the subscriber stations 110, the multiplexed signal is demultiplexed 314
to isolate the scrambled video signal, the scrambled video signal is unscrambled
316, and then the video signal is displayed 318, typically, on a television monitor
connected to a set-top box. The process in Fig. 3 is a typical conventional process
for delivering premium video using scrambling. Other conventional processes
also exist.
Fig. 4 is a schematic diagram of a cable distribution network including a
video on-demand source in accordance with a preferred embodiment of the
present invention. In addition to the components of the conventional cable
distribution network shown in Fig. 1, the cable distribution network shown in
Fig. 4 includes a video on-demand source 402 and a remote server 404. The
video on-demand source 402 may house, for example, a collection of video
programs such as, for example, movies. As shown in Fig. 4, the remote server
404 may be located within the distribution center 106. The remote server 404
may include, for example, a parallel processing computer configured to be a
video server, a disk drive array to store video data, and a video session manager
to provide session control of the video data flowing to and from the video server.
Fig. 5A is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a first aspect of the present invention. The process depicted in Fig. 5 A may be called a store,
decrypt, and re-encrypt process.
First, a video program is encrypted 502 by a video on-demand source 402
to generate an encrypted program in a first encrypted form. The encrypted
program is transported 504 via a primary distribution network from the video
on-demand source 402 to a remote server 404 within a distribution center 106.
The encrypted program is then stored 506 in the remote server 404.
Subsequently, when the remote server 404 receives 508 a request for
transmission of the video program from a subscriber station 110, the remote
server 404 responds by first decrypting 510 the video program from the first
encrypted form. A first key is may be used to accomplish such decryption 510,
and such key may have been received from the video on-demand source 402 via
a communication channel that is separate from the one used to transmit the
video program. After the video program is decrypted 510, the remote server 404
re-encrypts 512 the video program into a second encrypted form using a second
key.
The second key may be a public key of a public key encryption system.
Such a public key encryption system uses two different key: a public key to
encrypt data and a private key to decrypt data. In that case, decryption would
be accomplished using a corresponding private key of the public key encryption
system. Examples of such a public key encryption system is encryption under
the PGP (Pretty Good Privacy) system or under the RSA (Rivest, Shamir, and Adleman) system. Alternatively, the second key may be a private key of a
private key encryption system. Such a private key encryption system uses a
single private key to encrypt and decrypt data. Examples of such a private key
encryption system is encryption under the Data Encryption Standard (DES) or
under triple-DES which involves applying DES three times to enhance security.
The private key(s) itself may be transmitted from the remote server 404 to the
subscriber station 110 while encrypted in a third encrypted form.
After the video program is re-encrypted 512, the re-encrypted program in
the second encrypted form (and the second key if necessary) is multiplexed 514
with other signals to generate a multiplexed signal. The multiplexed signal is
then distributed 516 via the secondary distribution network 108 to the subscriber
stations 110.
At the subscriber stations 110, the multiplexed signal is demultiplexed 518
to isolate the re-encrypted program in the second encrypted form (and the
second key if necessary), the re-encrypted program is decrypted 520 from the
second encrypted form to generate the unencrypted video program, and then the
video program is displayed 522, typically, on a television monitor connected to
set-to p box.
Fig. 5B is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a second
aspect of the present invention. The process depicted in Fig. 5B may be called a
decrypt, re-encrypt, and store process. In comparison with the process in Fig. 5A, the process in Fig. 5B decrypts 510 and re-encrypts 512 the video program
before the video program is stored 506 in the remote server 404.
First, a video program is encrypted 502 by a video on-demand source 402
to generate an encrypted program in a first encrypted form. The encrypted
program is transported 504 via a primary distribution network from the video
on-demand source 402 to a remote server 404 within a distribution center 106. At
this point, the remote server 510 decrypts 510 the video program from the first
encrypted form. A first key is may be used to accomplish such decryption 510,
and such key may have been received from the video on-demand source 402 via
a communication channel that is separate from the one used to transmit the
video program. After the video program is decrypted 510, the remote server 404
re-encrypts 512 the video program into a second encrypted form using a second
key. After the decryption 510 and re-encryption 510, the re-encrypted program
is then stored 506 in the remote server 404.
Note that step 506 in Fig. 5B differs from step 506 in Fig. 5A in that step
506 in Fig. 5B involves storing the video program in the second encrypted form
while step 506 in Fig. 5 A involves storing the video program in the first
encrypted form.
Subsequently, when the remote server 404 receives 508 a request for
transmission of the video program from a subscriber station 110, the remote
server 404 responds by multiplexing 514 the re-encrypted program in the second
encrypted form (and the second key if necessary) with other signals to generate a multiplexed signal. The multiplexed signal is then distributed 516 via the
secondary distribution network 108 to the requesting subscriber station 110.
At the subscriber stations 110, the multiplexed signal is demultiplexed 518
to isolate the re-encrypted program in the second encrypted form (and the
second key if necessary), the re-encrypted program is decrypted 520 from the
second encrypted form to generate the unencrypted video program, and then the
video program is displayed 522, typically, on a television monitor connected to
set-top box.
Fig. 6 is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a third
aspect of the present invention. The process depicted in Fig. 6 may be called a
pass-through process.
First, a video program is encrypted 602 by a video on-demand source 402
to generate an encrypted program in a first encrypted form. The encrypted
program is transported 604 via a primary distribution network from the video
on-demand source 402 to a remote server 404 within a distribution center 106. A
key to decrypt the encrypted program may also be transported from the source
402 to the server 404. The encrypted program is then stored 606 in the remote
server 404.
The key may be a public key of a public key encryption system. Such a
public key encryption system uses two different key: a public key to encrypt
data and a private key to decrypt data. In that case, decryption would be accomplished using a corresponding private key of the public key encryption
system. Examples of such a public key encryption system is encryption under
the PGP (Pretty Good Privacy) system or under the RSA (Rivest, Shamir, and
Adleman) system. Alternatively, the key may be a private key of a private key
encryption system. Such a private key encryption system uses a single private
key to encrypt and decrypt data. Examples of such a private key encryption
system is encryption under the Data Encryption Standard (DES) or under triple-
DES which involves applying DES three times to enhance security. The private
key(s) itself may be transmitted from the source 402 to the server 404 while
encrypted in a second encrypted form. Alternatively, the private key(s) may be
transported from the source 402 to the server 404 via a communication channel
which is separate from the communication channel used to transport the video
program from the source 402 to the server 404.
Subsequently, when the remote server 404 receives 608 a request for
transmission of the video program from a subscriber station 110, the remote
server 404 responds by multiplexing 610 the encrypted program in the first
encrypted form (and the key if necessary) with other signals to generate a
multiplexed signal. The multiplexed signal is then distributed 612 via the
secondary distribution network 108 to the requesting subscriber station 110.
At the subscriber stations 110, the multiplexed signal is demultiplexed 614
to isolate the encrypted program in the first encrypted form (and the key if
necessary), the encrypted program is decrypted 616 from the first encrypted form to generate the unencrypted video program, and then the video program is
displayed 618, typically, on a television monitor connected to set-top box.
Fig. 7 is a flow chart depicting a secure process for distributing video on-
demand content via a cable distribution network in accordance with a fourth
aspect of the present invention. The process depicted in Fig. 7 may be called a
multiple-layer encryption process. In comparison with the process in Fig. 6, the
process in Fig. 7 pre-encrypts 702 the video program at the source 402, completes
encryption 704 of the video program at the remote server 404, and fully decrypts
706 the video program at the subscriber station 110.
The pre-encryption step 702 may be implemented by applying a single
DES encryption or a double DES encryption. If the pre-encryption step 702 uses
a single DES encryption, then the completion of encryption step 704 may be
implemented by applying a double DES encryption to achieve triple-DES
encryption. Similarly, if the pre-encryption step 702 uses a double DES
encryption, then the completion of encryption step 704 may be implemented by
applying a single DES encryption to achieve triple-DES encryption. In either
case, the video program is transported from the remote server 404 to the
subscriber station 110 while under triple-DES encryption. As long as the
subscriber station has the three keys required, it will be able to fully decrypt 706
the tripie-DES encryption to obtain the unencrypted video program.
It is to be understood that the specific mechanisms and techniques which
have been described are merely illustrative of one application of the principles of the invention. For example, while the present invention is described in
application to video on-demand, it also has some application in broadcast video.
Numerous additional modifications may be made to the methods and apparatus
described without departing from the true spirit of the invention.

Claims

WHAT IS CLAIMED IS:
1. A secure method performed by a remote server for providing video
programming requested by at least a first of a plurality of subscriber stations, the
method comprising:
receiving the video programming in a first encrypted form from a
programming source;
storing the video programming in the first encrypted form;
receiving a request from a subscriber station for transmission of the video
programming;
decrypting the video programming from the first encrypted form;
re-encrypting the video programming into a second encrypted form; and
causing transmission of the video programming in the second encrypted
form to the subscriber station.
2. The method as set forth in claim 1, wherein the video programming
in the second encrypted form is to be decrypted from the second encrypted form
using a key.
3. The method as set forth in claim 2, wherein the second encrypted
form comprises a form of public-key encryption, and the key comprises a private
key to decrypt the public-key encryption.
4. The method as set forth in claim 2, wherein the key is transmitted
to the subscriber station in a third encrypted form such that the subscriber
station must decrypt the key before decrypting the video programming.
5. The method as set forth in claim 2, wherein the second encrypted
form includes encryption utilizing a Data Encryption Standard.
6. The method as set forth in claim 1, wherein a key is used to decrypt
the video programming from the first encrypted form, and wherein the video
programming in the first encrypted form and the key are received from the
programming source via separate communication channels.
7. The method as set forth in claim 1, wherein causing transmission of
the video programming in the second encrypted form to the subscriber station
includes multiplexing the video programming in the second encrypted form
with other signals to create a multiplexed signal and causing transmission of the
multiplexed signal to the subscriber station.
8. The method as set forth in claim 1, wherein the remote server
comprises a remote video on-demand server.
9. The method as set forth in claim 1, wherein the remote server is
located within a head-end, and the transmission to the subscriber station occurs
via a secondary distribution network.
10. The method as set forth in claim 1, wherein the receiving from the
programming source occurs via a primary distribution network.
11. A secure method performed by a remote server for providing video
programming requested by at least a first of a plurality of subscriber stations, the
method comprising: receiving the video programming in a first encrypted form from a
programming source;
decrypting the video programming from the first encrypted form;
re-encrypting the video programming in a second encrypted form;
storing the video programming in the second encrypted form;
receiving a request from a subscriber station for transmission of the video
programming; and
causing transmission of the video programming into the second encrypted
form to the subscriber station.
12. The method as set forth in claim 11, wherein the video
programming in the second encrypted form is to be decrypted from the second
encrypted form using a key.
13. The method as set forth in claim 12, wherein the second encrypted
form comprises a form of public-key encryption, and the key comprises a private
key to decrypt the public-key encryption.
14. The method as set forth in claim 12, wherein the key is transmitted
to the subscriber station in a third encrypted form such that the subscriber
station must decrypt the key before decrypting the video programming.
15. The method as set forth in claim 12, wherein the second encrypted
form includes encryption utilizing a Data Encryption Standard.
16. The method as set forth in claim 11, wherein a key is used to
decrypt the video programming from the first encrypted form, and wherein the video programming in the first encrypted form and the key are received from the
programming source via separate communication channels.
17. The method as set forth in claim 11, wherein causing transmission
of the video programming in the second encrypted form to the subscriber station
includes multiplexing the video prograπuning in the second encrypted form
with other signals to create a multiplexed signal and causing transmission of the
multiplexed signal to the subscriber station.
18. The method as set forth in claim 11, wherein the remote server
comprises a remote video on-demand server.
19. The method as set forth in claim 11, wherein the remote server is
located within a head-end, and the transmission to the subscriber station occurs
via a secondary distribution network.
20. The method as set forth in claim 11, wherein the receiving from the
programming source occurs via a primary distribution network.
21. A secure method performed by a remote server for providing video
programming requested by at least a first of a plurality of subscriber stations, the
method comprising:
receiving the video programming in a first encrypted form from a
programming source;
storing the video programming in the first encrypted form;
receiving a request from a subscriber station for transmission of the video
programming; and responding to the request by causing transmission of the video
programming in the first encrypted form to the subscriber station.
22. The method as set forth in claim 21, wherein the video
programming in the first encrypted form is to be decrypted from the first
encrypted form using a key.
23. The method as set forth in claim 22, wherein the first encrypted
form comprises a form of public-key encryption, and the key comprises a private
key to decrypt the public-key encryption.
24. The method as set forth in claim 22, wherein the key is transmitted
to the subscriber station in a second encrypted form such that the subscriber
station must decrypt the key before decrypting the video programming.
25. The method as set forth in claim 22, wherein the first encrypted
form includes encryption utilizing a Data Encryption Standard.
26. The method as set forth in claim 21, wherein a key is used to
decrypt the video progr-urtming from the first encrypted form, and wherein the
video programming in the first encrypted form and the key are received from the
programming source via separate communication channels.
27. The method as set forth in claim 21, wherein causing transmission
of the video programming in the first encrypted form to the subscriber station
includes multiplexing the video progr-unming in the first encrypted form with
other signals to create a multiplexed signal and causing transmission of the
multiplexed signal to the subscriber station.
28. The method as set forth in claim 21, wherein the remote server
comprises a remote video on-demand server.
29. The method as set forth in claim 21, wherein the remote server is
located within a head-end, and the transmission from the remote server to the
subscriber station occurs via a secondary distribution network.
30. The method as set forth in claim 21, wherein the receiving from the
programming source occurs via a primary distribution network.
31. A secure method performed by a remote server for providing video
programming requested by at least a first of a plurality of subscriber stations, the
method comprising:
receiving the video programming in a pre-encrypted form from a
programming source;
storing the video programming in the pre-encrypted form;
receiving a request from a subscriber station for transmission of the video
prograrnrning;
completing encryption of the video programming to a fully encrypted
form; and
causing transmission of the video programming in the fully encrypted
form to the subscriber station.
32. The method as set forth in claim 31, wherein the fully encrypted form
comprises a triple-DES encrypted form.
33. The method as set forth in claim 32, wherein the pre-encrypted form
comprises a single-DES encrypted form.
34. The method as set forth in claim 32, wherein the pre-encrypted form
comprises a double-DES encrypted form.
PCT/US2000/006480 1999-03-12 2000-03-10 Secure distribution of video on-demand WO2000054493A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU38789/00A AU3878900A (en) 1999-03-12 2000-03-10 Secure distribution of video on-demand
CA002367449A CA2367449C (en) 1999-03-12 2000-03-10 Secure distribution of video on-demand
GB0121689A GB2363928B (en) 1999-03-12 2000-03-10 Secure distribution of video on-demand

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/267,800 US6229895B1 (en) 1999-03-12 1999-03-12 Secure distribution of video on-demand
US09/267,800 1999-03-12

Publications (1)

Publication Number Publication Date
WO2000054493A1 true WO2000054493A1 (en) 2000-09-14

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ID=23020173

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US (5) US6229895B1 (en)
AU (1) AU3878900A (en)
CA (1) CA2367449C (en)
GB (1) GB2363928B (en)
WO (1) WO2000054493A1 (en)

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US7930724B2 (en) 2011-04-19
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CA2367449A1 (en) 2000-09-14
CA2367449C (en) 2005-10-11
US20110185380A1 (en) 2011-07-28
US20040091109A1 (en) 2004-05-13
US6229895B1 (en) 2001-05-08
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US20010017920A1 (en) 2001-08-30
US8370883B2 (en) 2013-02-05
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US8973027B2 (en) 2015-03-03
US20130152122A1 (en) 2013-06-13

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