WO2001031923A1 - Procede et dispositif permettant d'assurer une distribution et une reception securisees et une exploitation autorisee et securisee de donnees audiovisuelles numeriques - Google Patents

Procede et dispositif permettant d'assurer une distribution et une reception securisees et une exploitation autorisee et securisee de donnees audiovisuelles numeriques Download PDF

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Publication number
WO2001031923A1
WO2001031923A1 PCT/US2000/041520 US0041520W WO0131923A1 WO 2001031923 A1 WO2001031923 A1 WO 2001031923A1 US 0041520 W US0041520 W US 0041520W WO 0131923 A1 WO0131923 A1 WO 0131923A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhibitor
data
audiovisual data
digital audiovisual
authorization
Prior art date
Application number
PCT/US2000/041520
Other languages
English (en)
Inventor
Michael A. Karagosian
Clyde R. Mckinney
Original Assignee
Mkpe Consulting
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 Mkpe Consulting filed Critical Mkpe Consulting
Priority to AU24705/01A priority Critical patent/AU2470501A/en
Publication of WO2001031923A1 publication Critical patent/WO2001031923A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8358—Generation of protective data, e.g. certificates involving watermark
    • 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
    • H04N21/41415—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk
    • 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
    • H04N21/45—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
    • H04N21/4508—Management of client data or end-user data
    • H04N21/4524—Management of client data or end-user data involving the geographical location of the client
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8355—Generation of protective data, e.g. certificates involving usage data, e.g. number of copies or viewings allowed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Definitions

  • the present invention relates generally to secure data communication, and more specifically to secure distribution, receipt, and exhibition of digital audiovisual data.
  • One way to secure digital data is encryption.
  • Many encryption techniques and algorithms are known, and can be used to encrypt digital movie data before it is distributed. Distribution of encrypted movie data requires that a key to decrypt the data be obtained by a theater operator who wishes to exhibit the movie. To maintain a single inventory of movie data by the distribution company, it is desirable to encrypt all copies of a given movie title utilizing a single key. However, it is also desirable to ensure that only an individual, authorized exhibitor be able to decrypt and exhibit an individual distributed copy of a motion picture intended for that exhibitor.
  • Existing encryption technology does not provide a way to encrypt multiple copies of data with a single key, and at the same time to ensure that each individual copy can be decrypted by only an individual intended recipient.
  • encryption can protect electronic data from theft during distribution, it cannot prevent all forms of piracy.
  • the encrypted movie data In order to exhibit a movie, the encrypted movie data must first be decrypted.
  • encrypted data is decrypted on a secure computer system which enacts a decryption algorithm, and which stores a decryption key in memory.
  • the security of such computer systems and decryption keys is at risk. If theft of the digital data is possible, then it is equally likely that the computers and memory devices that are required to enact the security process are vulnerable to theft as well.
  • Such a security system is thus vulnerable to theft because it can be stolen and used to exhibit the motion picture at another location and in circumvention of restrictions and constraints normally imposed upon the distribution and exhibition of the motion picture.
  • Another problem with contemporary digital cinema is ensuring that a motion picture can only be exhibited during an authorized range of dates.
  • traditional film the film print is returned to the distribution company after the movie exhibition dates have expired. In this manner, the distribution company maintains control over the whereabouts of the movie, preventing unauthorized exhibition and other forms of theft.
  • digital, electronic motion picture distribution the data comprising the movie is normally not returned to the distributor. Thus, techniques are required for ensuring that the movie data can only be played during a fixed, authorized range of dates.
  • Encrypted digital movie data is provided by a movie distributor to at least one exhibitor. Because the data is encrypted, the distribution is secure.
  • All distributed copies of a given movie title can be encrypted with the same key, thereby allowing single inventory of movie data by a distributor.
  • a movie decryption key and exhibitor authorization data are distributed to each exhibitor.
  • the key and authorization data are distributed separately from the movie data, and are preferably encrypted with a key that is unique to the intended exhibitor recipient. Unlike the movie data itself, the key and authorization data need not be singly inventoried by the distributor and thus do not require that all copies be encrypted with the same key.
  • the exhibitor authorization data contains information uniquely identifying the exhibitor, as well as valid authorized dates for exhibition of the movie.
  • each exhibitor receives unique authorization data for each received digital movie.
  • the exhibitor identification information in the authorization data includes a unique exhibitor identification code, and a location of the exhibitor generated by a global positioning system.
  • other data such as a projector serial number can be used as all or part of the identification information as desired.
  • the authorization data is compared with local data provided by an exhibitor.
  • local data comprises date, time, and location information provided by a global positioning system receiver. Only upon match up of the local data with the authorization data can the decryption and subsequent exhibition of the movie data occur.
  • the authorization data contains the range of authorized dates during which the movie may be exhibited, and the local data to be compared with the authorization data includes the date. Thus, the movie cannot be decrypted or exhibited outside of the range of authorized dates.
  • signature data is presented to a device analogous to a watermarking device which encodes a unique signature into the visual image and audio signals.
  • This signature is based upon information which uniquely identifies the exhibitor.
  • the signature data is similar to the authorization data, and can include an exhibitor identification number, date, time, and location.
  • the signature data can be recovered from illicitly copied material. Known methods can be used to create such a so-called watermark that can then be recovered from analog copies of data.
  • the watermark provides a scheme for identifying the exhibition source of a pirated copy of a movie, even where the theft involves analog copying.
  • FIG. 1 is a flowchart illustrating the process of distributing digital audiovisual data to at least one exhibitor in accordance with one preferred embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating the process of receiving and exhibiting digital audiovisual data by an exhibitor in accordance with one preferred embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a system utilized to ensure that an exhibitor is authorized to exhibit the digital audiovisual data in accordance with an embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating exhibitor identification data in accordance with one embodiment of the present invention.
  • the present invention enables secure distribution, receipt, and exhibition of digital audiovisual data.
  • audiovisual is used herein to mean "audio” or "visual.”
  • the digital audiovisual data is distributed by a distributor to at least one exhibitor.
  • the digital audiovisual data is encrypted.
  • Each exhibitor securely receives the encrypted digital audiovisual data.
  • the authorization of the exhibitor is verified, and only upon verification is an exhibitor allowed to decrypt and exhibit the digital audiovisual data.
  • the audiovisual data Prior to exhibition, the audiovisual data is encoded with unique data identifying the exhibitor. Unauthorized analog copies made from the exhibition of audiovisual data can be traced through the identifying data.
  • the flowchart of FIG. 1 illustrates the process of distributing digital audiovisual data according to an embodiment of the present invention.
  • a distributor encrypts 101 digital audiovisual data.
  • the digital audiovisual data comprises a motion picture, but the digital audiovisual data may also comprise television programs, visual image communication data, and the like, as desired.
  • a known encryption method such as RSA, Skipjack, DES, Blowfish, or the like is utilized to encrypt 101 the digital audiovisual data.
  • every copy of a motion picture (or other audiovisual data in alternative embodiments) is encrypted 101 using a single key, to facilitate single inventory of the data by the distributor.
  • each copy of a motion picture may be encrypted with a separate, unique key.
  • the digital audiovisual data is encrypted in a conventional manner by computer software residing in memory of a computer system including a central processing unit.
  • the digital audiovisual data may be encrypted by hardware, firmware, or any combination of software, hardware and firmware, as desired.
  • the distributor assembles 103 exhibitor authorization data for each exhibitor who is to receive the digital audiovisual data.
  • Exhibitor authorization data is used to verify that an exhibitor is authorized to receive and exhibit the digital audiovisual data, and is thus unique for each exhibitor.
  • FIG. 4 illustrates exhibitor identification data 401 in one embodiment of the present invention.
  • Exhibitor authorization data 401 for each exhibitor comprises exhibitor identification information 403, audiovisual data identification information 405, and valid dates of exhibition 407 of the audiovisual data.
  • the exhibitor authorization data 401 may also contain additional information, for example including distributor identification information.
  • the exhibitor authorization data 401 may contain less information, for example, with valid dates of exhibition 407 omitted because the exhibitor purchased a license to exhibit the audiovisual data without date restrictions.
  • the exhibitor identification information 403 contained in the exhibitor authorization data 401 comprises location information of the exhibitor such as is generated by a global positioning system, and constitutes an authorized location for the exhibition of the digital audiovisual data.
  • exhibitor identification information 403 may comprise other data such as a serial number of an exhibitor's digital movie projector or an assigned exhibitor identification code, as desired.
  • the exhibitor authorization data 401 may also be encrypted 105, or may be present in clear digitized text.
  • the exhibitor authorization data 401 for each exhibitor is encrypted 105 utilizing a key unique to that exhibitor.
  • exhibitor authorization data 401 is distributed to a given exhibitor in encrypted form utilizing that exhibitor's public key of an encryption method such as RSA that requires a public key and a private key.
  • a public and a private key for each exhibitor are preferably generated by the distributor.
  • the public key is used to encrypt 105 exhibitor authorization data 401, and the private key is used, by the exhibitor, to decrypt the exhibitor authorization data 401.
  • Various secure channels may be utilized to distribute the private key to the exhibitor. Distribution of the private key is discussed in detail later in this specification.
  • the above-described encryption of the exhibitor authorization data 401 may be modified in alternative embodiments to include public and private keys generated by each exhibitor rather than by the distributor, may be modified to include a single key to encrypt and decrypt the data, and may be modified to include a key that is not unique to the exhibitor.
  • the exhibitor authorization data 401 is not encrypted at all, but instead may appear in clear digitized text, as desired.
  • the key to decrypt the encrypted audiovisual data for each exhibitor is encrypted 107 utilizing a key unique to that exhibitor. Preferably, this is the same key used to encrypt 105 the exhibitor authorization data 401, as described above.
  • the alternative embodiments described above for the encryption of the exhibitor authorization data 401 also apply to the encryption of the key to decrypt the audiovisual data.
  • the digital audiovisual data, the key to decrypt the encrypted audiovisual data, and the exhibitor authorization data 401 are distributed to at least one exhibitor.
  • the digital audiovisual data is distributed 109 separately from the key to decrypt the digital audiovisual data, and from the exhibitor authorization data 401, over a secure communication channel, such as telephone, Internet, leased communication line, and the like.
  • the distribution of the digital audiovisual data can be by transmission over such public channels as the Internet, telephone lines, fiber optic cable, satellite, or the like, as desired.
  • the digital audiovisual data may be distributed on magnetic or optical media.
  • the exhibitor authorization data 401 and the key to decrypt the encrypted audiovisual data are embedded 111 in a computer program to be distributed to an exhibitor.
  • the computer program also contains program code to verify that an exhibitor is authorized to exhibit the audiovisual data, and program code to process the results of the verification.
  • program code to verify that an exhibitor is authorized to exhibit the audiovisual data
  • program code to process the results of the verification. The operation of such computer program is described in detail later in this specification.
  • For each exhibitor to receive the digital audiovisual data a copy of the computer program is created containing the exhibitor authorization data 401 for that exhibitor, as well as the key to decrypt the digital audiovisual data.
  • the appropriate copy of the computer program is distributed 113 by conventional schemes to each exhibitor that receives the digital audiovisual data.
  • the computer program is preferably distributed over a secure public channel such as the Internet, but can also be distributed on magnetic or optical media, as desired.
  • assembling the exhibitor authorization data 401, encrypting the exhibitor authorization data 401, encrypting the key to decrypt the digital audiovisual data, and embedding the exhibitor authorization data 401 and the key to decrypt the encrypted audiovisual data in a copy of the computer program are performed by computer software residing in computer memory of a computer system with a central processing unit.
  • FIG. 2 is a flowchart illustrating the steps involved in receiving and exhibiting digital audiovisual data by an exhibitor in accordance with one embodiment of the present invention.
  • an exhibitor receives 201 encrypted digital audiovisual data.
  • the digital audiovisual data comprises a motion picture, but may also be other forms of digitized data as previously explained.
  • the exhibitor receives 203 exhibitor authorization data 401 and a key to decrypt the encrypted audiovisual data.
  • the receipt of the digital audiovisual data is separate from the receipt of the exhibitor authorization data 401 and from the key to decrypt the encrypted audiovisual data.
  • the exhibitor authorization data 401 and key to decrypt the encrypted audiovisual data are embedded in a computer program which is received 203 from the distributor.
  • FIG. 3 illustrates one system utilized for verification of this authorization and subsequent exhibition of digital audiovisual data in accordance with one embodiment of the present invention.
  • a computer system 301 contains a central processing unit 303, computer memory 305, and storage device 307 such as at least one magnetic disk or at least one writeable optical disk. Data is received via at least one input mechanism 309 such as modem, cable, network card, satellite receiver, floppy disk drive, and the like, and is transmitted to audiovisual data exhibition hardware via an output mechanism 311.
  • the audiovisual data exhibition hardware comprises a digital projector 313 and an audio playback system 315.
  • the computer system 301, digital projector 313 and audio playback system 315 can all be components of a single physical device, or can be separate, physically discrete devices as desired. Separate hardware components of these types are required to be physically or logically connected, for example by a local area computer network, by telephone lines, or by a wireless, electromagnetic radiation-based communication system.
  • the computer system 301 is a component of the digital projector 313.
  • the computer program 317 is loaded into the computer memory 305 of the computer system 301 via an input mechanism 309.
  • the computer program 317 is then executed 205 by the central processing unit 303 of the computer system 301 to retrieve 207 exhibitor identification data 319 that uniquely identifies the exhibitor.
  • the exhibitor identification data 319 comprises a location of the exhibitor and a current date. This information is preferably provided by a global positioning system (GPS) receiver 321 coupled to the computer system 301.
  • GPS global positioning system
  • the exhibitor identification data 319 comprises other information such as a digital projector serial number or an assigned exhibitor identification code, as desired.
  • the computer program 317 verifies that the exhibitor is authorized to exhibit the digital audiovisual data 327 at a current date within a range of dates. Where the exhibitor authorization data 401 is encrypted, as in one preferred embodiment, the computer program 317 must decrypt 209 it in order to proceed. To do so, the computer program 317 preferably accesses the private key 325 of the exhibitor. As explained above, the private key 325 is preferably unique to the exhibitor, and is supplied by the distributor. In a preferred embodiment of the present invention, the private key 325 is distributed to the exhibitor on physical media, such a floppy disk or CD-ROM. Alternatively, the private key 325 can be distributed over a secure transmission channel such as the Internet, or the like, as desired.
  • the private key 325 is stored by the distributor, and accessed by the exhibitor as needed. In such an embodiment, the identification of the exhibitor is verified prior to allowing access of the private key 325. In every embodiment that includes a private key 325, a new private key 325 is generated from time to time and made available to the exhibitor. In an alternative embodiment, the public and private key combination is generated by the exhibitor instead of by the distributor. In that embodiment, the public key is made available to the distributor and used for the encryption. The private key 325, held by the exhibitor, is then used for the decryption. Once the exhibitor authorization data 401 has been decrypted 209, the computer program 317 proceeds to verify that the exhibitor is authorized to exhibit the digital audiovisual data 327.
  • the computer program 317 first compares 211 the exhibitor authorization data 401 to the exhibitor identification data 319.
  • an authorized location for the exhibition of the digital audiovisual data 327 in the exhibitor authorization data 401 provided by the distributor is compared 211 with the location of the exhibitor contained in the exhibitor identification data 319.
  • the location of the exhibitor contained in the exhibitor identification data 319 is preferably provided by a GPS receiver 321. Because the location of the authorized exhibitor is known to the distributor and is included in the exhibitor authorization data 323, the location of the exhibitor provided by the GPS receiver 321 can be used to verify the authorization of the exhibitor.
  • the digital audiovisual data 327, projection equipment 313, and GPS receiver 321 are stolen, the digital audiovisual data 327 will still be secure.
  • the authorization check performed prior to exhibition will fail at least because the stolen and relocated GPS receiver 321 will report a different location from that provided by the distributor.
  • the comparison of GPS location data is performed with moderate precision and not finite precision, so that movement of the GPS receiver 321 or antenna within an exhibitor's site does not result in a verification failure.
  • data other than location is used to verify the identity of the exhibitor such as a serial number of the projection equipment 313, or a password, or the like.
  • the current date is verified 213 against the range of dates during which the exhibitor is authorized to exhibit the digital audiovisual data 327.
  • this range of dates is preferably included in the exhibitor authorization data 323.
  • the current date is preferably provided by the GPS receiver 321.
  • the current date is provided by the operating system of the computer system 301. Either way, the computer program 307 verifies 213 that the c rent date is within the authorized range.
  • the computer program 317 If the identity of the exhibitor and the date are successfully verified, the exhibition of the digital audiovisual data 327 is allowed to proceed. However, if either the identity of the exhibitor, or the authorization to exhibit on the current date is not confirmed, the computer program 317 does not decrypt the digital audiovisual data 327, which therefore cannot be exhibited 215. Preferably, the computer program 317 erases the digital audiovisual data 327 and decryption key. Preferably the computer program 317 transmits a control signal to the distributor indicating that an attempt is occurring to execute an unauthorized exhibition of the digital audiovisual data 327 at a given location. Then, the computer program 317 terminates.
  • the computer program 317 proceeds to decrypt 217 the key 325 needed to decrypt the digital audiovisual data 327.
  • This key 325 is preferably encrypted with the same key as the exhibitor authorization data, and is decrypted in the same manner, as described above.
  • the digital audiovisual data 327 is then decrypted 219 by the computer program 317. At this point, the audiovisual data is ready to be watermarked prior to exhibition.
  • the use of the computer program 317 as described above represents one mode of practicing the present invention, in alternative embodiments of the present invention, there is no computer program 317, and the exhibitor authorization data 401 and key 325 to decrypt the digital audiovisual data 327 are received by themselves.
  • the exhibitor authorization data 401 and key 325 to decrypt the digital audiovisual data 327 are loaded into the computer memory 305 of the computer system 301 at the exhibitor site.
  • all of the steps that are performed by the computer program 317 in the embodiment described above are instead performed by software (or, in other embodiments by hardware, firmware, or any combination of software, hardware, and firmware as desired) which comprises a component of the exhibitor's computer system 301.
  • the audiovisual data is watermarked 221 with unique identifying data prior to exhibition.
  • the identifying data can be provided by a date and time clock, or a memory device containing unique data stored by the projector manufacturer, or a memory device containing unique data stored by the exhibitor, or unique signature data provided through a local-area network (LAN), or the GPS receiver 321.
  • LAN local-area network
  • the identifying data comprises the location and date information provided by the GPS receiver 321.
  • the present invention is not dependent upon the choice of watermarking technology used to encode the identifying information in the visual image and audio signal.
  • Various known watermarking technologies that are currently commercially available can be utilized as desired to watermark 221 both visual image and audio signals, or alternatively to watermark 221 only the audio signal or only the visual image signal.
  • Watermarking technology by its nature, imprints the data with the watermarking information which can facilitate the recovery of the encoded identifying data, and thus aid in the identification of an analog theft. Once the data is watermarked 221, it can be exhibited 223.

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

Abstract

Un exploitant reçoit des données audiovisuelles numériques (103) ainsi qu'une autorisation d'exploitation de la part d'un distributeur. L'autorisation d'exploiter les données audiovisuelles numériques délivrée à l'exploitant est validée par la comparaison des données d'autorisation d'exploitant avec des données d'identification fournies par l'exploitant. Les données audiovisuelles sont déchiffrées (107) et exploitées seulement après vérification de l'autorisation de l'exploitant. Les données audiovisuelles sont marquées d'un filigrane contenant une information d'identification (111) qui permet de remonter jusqu'à la source des copies pirate analogiques.
PCT/US2000/041520 1999-10-26 2000-10-24 Procede et dispositif permettant d'assurer une distribution et une reception securisees et une exploitation autorisee et securisee de donnees audiovisuelles numeriques WO2001031923A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU24705/01A AU2470501A (en) 1999-10-26 2000-10-24 Method and apparatus for ensuring secure distribution and receipt, and secure authorized exhibition of digital audiovisual data

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42777699A 1999-10-26 1999-10-26
US09/427,776 1999-10-26

Publications (1)

Publication Number Publication Date
WO2001031923A1 true WO2001031923A1 (fr) 2001-05-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003034733A1 (fr) * 2001-10-18 2003-04-24 Macrovision Corporation Appareil et procede pour l'acces a un materiel a l'aide d'un registre securise verrouille par entite
WO2006088596A2 (fr) * 2005-02-15 2006-08-24 Thomson Licensing Systeme de gestion de cles pour cinema numerique
US20100321493A1 (en) * 2008-03-07 2010-12-23 Thomson Licensing Apparatus and method for remote monitoring

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US4739510A (en) * 1985-05-01 1988-04-19 General Instrument Corp. Direct broadcast satellite signal transmission system
US4751732A (en) * 1984-07-06 1988-06-14 Kabushiki Kaisha Toshiba Broadcasting system
US5142576A (en) * 1989-02-07 1992-08-25 Market Data Corporation System for securely providing restricted video information

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Publication number Priority date Publication date Assignee Title
US4751732A (en) * 1984-07-06 1988-06-14 Kabushiki Kaisha Toshiba Broadcasting system
US4739510A (en) * 1985-05-01 1988-04-19 General Instrument Corp. Direct broadcast satellite signal transmission system
US5142576A (en) * 1989-02-07 1992-08-25 Market Data Corporation System for securely providing restricted video information

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003034733A1 (fr) * 2001-10-18 2003-04-24 Macrovision Corporation Appareil et procede pour l'acces a un materiel a l'aide d'un registre securise verrouille par entite
WO2006088596A2 (fr) * 2005-02-15 2006-08-24 Thomson Licensing Systeme de gestion de cles pour cinema numerique
WO2006088596A3 (fr) * 2005-02-15 2007-06-07 Thomson Licensing Systeme de gestion de cles pour cinema numerique
JP2008530902A (ja) * 2005-02-15 2008-08-07 トムソン ライセンシング ディジタル映画のための鍵管理システム
CN101124822B (zh) * 2005-02-15 2010-08-25 汤姆逊许可公司 密钥管理方法以及密钥管理器系统
JP2013066187A (ja) * 2005-02-15 2013-04-11 Thomson Licensing ディジタル映画のための鍵管理システム
US8483393B2 (en) 2005-02-15 2013-07-09 Thomson Licensing Key management system for digital cinema
US20100321493A1 (en) * 2008-03-07 2010-12-23 Thomson Licensing Apparatus and method for remote monitoring

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