EP1472692A1 - Systeme et procede pour le codage et le decodage, la transmission et le stockage, proteges contre la copie et l'utilisation abusive, de supports electroniques audio et video - Google Patents

Systeme et procede pour le codage et le decodage, la transmission et le stockage, proteges contre la copie et l'utilisation abusive, de supports electroniques audio et video

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Publication number
EP1472692A1
EP1472692A1 EP02806311A EP02806311A EP1472692A1 EP 1472692 A1 EP1472692 A1 EP 1472692A1 EP 02806311 A EP02806311 A EP 02806311A EP 02806311 A EP02806311 A EP 02806311A EP 1472692 A1 EP1472692 A1 EP 1472692A1
Authority
EP
European Patent Office
Prior art keywords
data
media
encrypted
key
melody
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Withdrawn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
EP02806311A
Other languages
German (de)
English (en)
Inventor
Juergen K. Lang
Ursula Maria Bing
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1472692A1 publication Critical patent/EP1472692A1/fr
Withdrawn legal-status Critical Current

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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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/441—Acquiring end-user identification, e.g. using personal code sent by the remote control or by inserting a card
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00137—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users
    • G11B20/00159—Parental control systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00818—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00855—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a step of exchanging information with a remote server
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00884—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
    • H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
    • H04N21/44055—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—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
    • 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
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00007—Time or data compression or expansion
    • G11B2020/00014—Time or data compression or expansion the compressed signal being an audio signal
    • G11B2020/00057—MPEG-1 or MPEG-2 audio layer III [MP3]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/10537—Audio or video recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91328—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled

Definitions

  • the invention relates to a system and method for copy and usage-protected encryption and decryption, transmission and storage of electronic audio and video media, the data contents of the electronic media being processed, modulated and encrypted in such a way that their complete reproduction or display is carried out in order to carry out cryptographic decryption processes in the case of recipients entitled to a certain scope of use, and that even within the framework of encryption, in the event that such cryptographic decryption processes are not carried out, the extent to which the quality of presentation and reproduction and the possible uses are reduced can be defined dynamically.
  • the purpose of the high quality is to use the digital data to complete the analogue audio signal as completely as possible to capture.
  • modulation i.e. the way in which analog audio signals are recorded digitally, are pulse code modulation (PCM), in which the amplitude of the audio signal is sampled at regular intervals in absolute values, or delta modulation, in which the amplitude changes in a certain period of time.
  • PCM pulse code modulation
  • delta modulation in which the amplitude changes in a certain period of time.
  • sampling rate plays a role, i.e. the temporal frequency with which the amplitude of a sound signal is measured (twice the highest measurable and reproducible sound frequency, e.g. 44.1 kHz), as well as the accuracy of the storage of the measured frequency value (rounding eg to 16 bit).
  • the purpose of the robustness of the data is to detect or improve digital errors that occur. This is achieved, among other things. through suitable introduction of additional information (so-called redundancies) and the temporal shifting and interleaving of the digital data stream in relation to the original analog audio signal, in order to distribute larger digital error points into several and possibly even smaller error points in the analog signal that is subsequently restored.
  • redundancies additional information
  • a popular method used in the CD system is, for example, error correction according to Reed-Solomon.
  • the purpose of the compactness of the data is to reduce the amount of data to be transferred or stored to a minimum.
  • compression processes a distinction is made between quality-reducing processes (irreversible compression) and those without loss of quality (reversible compression).
  • avoiding loss of quality or information is only possible with the reduction and thus loss of important additional information or redundancies, so that permanently strong compression methods are generally irreversible.
  • Target high quality compression processes like For example, the popular mpeg / mp3 method for compressing sound and image data is to reduce the amount of data to a far greater extent than the subjectively (barely) perceptible loss of quality.
  • the aim in the analog TV area is to enable full playback only by using a special decoder. Since in such a decoder there is usually a simple way of decrypting the video signal (analog phase shift), this procedure can basically also be considered under the generic term of encryption.
  • cryptographic encryption can in principle also be relevant for other applications, for example the electronic transmission of sound and image data.
  • data values that are relevant for the representation of the analog signal eg amplitudes or phase values
  • Symmetrical or asymmetrical processes or a combination of both (hybrid processes) are often used.
  • asymmetrical methods are alternatively used, in which the transmitter and receiver usually have an asymmetrical key pair consisting of a private and a public key. While the private key always remains with the owner, the public key can be freely distributed and exchanged.
  • the principle of asymmetric encryption is that data that is encrypted with a recipient's public key can only be decrypted with his private key. This means that digital data can be encrypted without sharing secrets.
  • the invention is based on the object of further developing existing systems and methods for modulating and encrypting electronic audio and video media and their data contents in such a way that they are processed, modulated and encrypted in such a way that their complete reproduction or display is carried out in order to carry out cryptographic decryption processes in the case of recipients who are authorized for a certain scope of use and that, within the scope of encryption, in the event that such cryptographic decryption processes are not carried out, the extent to which the display and reproduction quality and the possible uses are reduced can be defined dynamically.
  • the object is achieved in that the electronic sound and image data are dynamically divided into unencrypted media and user data, encrypted media and user data, key-containing crypto-melody data and key data, which, after transmission and secure decryption, enable the recipient to use them, in particular enable storage, display and playback in real time, and ensure it is cost-effective.
  • An advantageous embodiment of the method and a preferred embodiment of the system are distinguished by the fact that the scope of the encryption is variable, so that the ratio between the unencrypted or non-encrypted portion and the encrypted or encrypted portion of the sound and image data is chosen as desired can be.
  • the system and method are expediently characterized in that the crypto-melody data and / or the user data contain information about the use of the encrypted data for the intended use, that is to say the conditions under which the data can be decrypted.
  • the conditions under which the data can be decrypted contain information about the costs or the tariff class of the respective use with regard to the type of use and the duration of use.
  • conditions under which the data can be decrypted contain information about whether private or specific or indefinite commercial use is intended.
  • the conditions under which the data can be decrypted contain information about how often the audio and visual media can still be reproduced.
  • conditions under which the data can be decrypted contain information about whether and how often the audio and visual media can still be copied.
  • the conditions under which the data can be decrypted contain information about the genre or another classification of the content of the audio and visual media.
  • An advantageous embodiment of the method and a preferred embodiment of the system are distinguished by the fact that the author, creator, processor or distributor of the electronic audio and video media encrypts or encrypts the unencrypted output data in whole or in part in such a way that it proportionately relates to the unencrypted and split the encrypted media data.
  • the encryption or encryption of the electronic sound and image media is carried out by the author, creator, processor or distributor using a "melody" key which is contained in the crypto melody data in unencrypted or encrypted form is.
  • the "melody" key for partial or complete encryption or encryption of the electronic audio and video media which is contained in the crypto-melody data, is encrypted with a "media” key, which is in encrypted or unencrypted form is included in the key data.
  • the "melody" key for partial or complete encryption or encryption of the electronic audio and video media, which is contained in the crypto-melody data is valid for a certain period of time, which is shorter than the audio and image data.
  • the “media” key for decrypting the “melody” keys contained in the crypto melody data is contained in the key data in encrypted or unencrypted form.
  • the “media” key contained in the key data is itself encrypted. It is furthermore expedient that the encrypted “media” key contained in the key data for decrypting the “melody” key contained in the cryptomelody data is provided with a trustworthy digital signature.
  • the unencrypted user data contains information about the type and with which “main” and “media” keys the keys for partial or complete decryption or decryption of the electronic audio and video media are encrypted.
  • An advantageous embodiment of the method and a preferred embodiment of the system are distinguished by the fact that the cryptomelody contains, in chronological order, encrypted information which, after decryption, can be used to decrypt the encrypted media data.
  • the crypto melody is encrypted with the “media” key that was used for the encryption of the electronic sound and image media by the author, creator, processor or distributor and that is contained in the key data.
  • MP3 received special support from the "Napster" Internet exchange, which is partly on the verge of legality and partially outside of legality, apparently offered private exchanges between Internet users in general in a public setting and thus promoted the illegal distribution of music tracks to third parties.
  • M.sec meets this need by offering the following advantages:
  • the encrypted sound and image data can be provided with certain usage rights (e.g. number of reproductions and copying processes) and other additional information.
  • m.sec provides the following architecture:
  • the recipient has an individual, personalized chip card (the so-called “m.card”) which, as a cryptographic module, provides functionalities that cannot be manipulated by him. (Cf. "Cryptographic module for the recipient, m.card” in Fig. 1)
  • Corresponding playback and display devices e.g. personal computer, CD player, Walkman, TV etc.
  • the plug-in chip card m.card
  • FIG. 1 The three possible transmission paths, identified as A, B and C, are shown in FIG. 1:
  • transmission path A e.g. television, TV
  • transmission path B there is usually a remote transmission of audio and video media (e.g. as an Internet download) as dedicated, closed files.
  • Image media e.g. CDs or DVDs
  • Image media e.g. CDs or DVDs
  • the m.card serves as an instrument for encoding between the encryption of the publisher and the playback unit.
  • the encryption by the publisher is reversed within the m.card by decryption, the right to playback is checked and playback is initiated.
  • This conversion is usually associated with costs, e.g. can be tracked in the cryptographic module. In FIG. 1, this corresponds to the transmission path A in connection with the measure for the recipient, identified by the number 1), namely immediate playback.
  • the m.card serves as a conversion tool between the publisher's encryption and personal encryption
  • Encryption of the m.card This conversion is usually associated with costs that can be tracked, for example, in the cryptographic module. In FIG. 1, this corresponds to the transmission path B in connection with the measure at the recipient, identified by the number 2), namely the local storage of the Information.
  • the encryption is canceled by the publisher within the m.card by decryption, the right to create a local copy is checked, the encryption is carried out with the m.card's own key and the creation of a copy is initiated.
  • the m.card serves as a conversion key between the encryption of the publisher and the playback unit.
  • the encryption by the publisher is reversed within the m.card by decryption, the right to playback is checked and playback is initiated.
  • This conversion is usually associated with costs, e.g. can be tracked in the cryptographic module. In FIG. 1, this corresponds to the transmission path C in connection with the measure for the recipient, identified by the number 1), namely immediate playback. If the audio and video information is not in the decrypted state according to Number 2 temporarily stored in FIG. 1, the information about the first decryption of precisely defined sound and image data can be stored either in the cryptographic module itself or outside the cryptographic module, provided with a digital signature of the cryptographic module, for the repeated reproduction of the unencrypted data be deposited.
  • the content of audio and visual media (for a separate fee, for example) is activated as "re-publishable" and encrypted again with the m.card's own key, it can be passed on to third parties.
  • third parties can decrypt it (for example, for a fee), as is possible with sound and image data that come directly from publishers.
  • unencrypted user data (“data.plain”), which contains information on the title, artist, structure and indexing, genre, accompanying information and last but not least on the time sequence (“dock”) (a complete set of unencrypted user data can be over several
  • a “melody” key always refers to a frame. However, it is possible to use “melody” keys that are valid over several frames.
  • the key data is optional and can be omitted or replaced with filler data if the corresponding key does not have to be added to the media data.
  • the proportion between unencrypted and encrypted media data and user data can differ from frame to frame, as can the length of frames.
  • Key data and possibly also user data can be divided into several frames (especially with long keys and additional information). See Fig. 2.
  • the crypto melody is an essential security element that significantly increases the overall security of the transmitted data compared to conventional methods without requiring too much additional cryptographic computational effort.
  • the core of the crypto melody is a random number serving as a temporary "melody" key, the validity of which usually extends to one frame. This temporary key is used to decrypt the encrypted rarely media data and the encrypted user data possible.
  • This sound and image data is encrypted with the "melody” keys of the next circle or the surrounding shell.
  • These "melody” keys are randomly determined, frequently changing keys that are only valid for a certain amount of time (or “frame”). If one assumes that the "melody key is changed once per second, a total of approximately 40,000 to 100,000 media values (and possibly also user data) are encrypted with this key. This number results if, for example, the sampling rate of 44,100 samples per second, which is common for digital audio signals, is used.
  • the “melody” keys are in turn encrypted with the "media” key, which is shown in the next circle or the surrounding shell.
  • This "media key will be used by publishers e.g. provided by a certification body once a year.
  • the “media” key is used to encrypt each individual “melody key. Assuming 4000" melody “keys or” frames “changing every second and 100 to 250 published media per year, the total use of a" media “results - Key for approx. 400,000 to 1,000,000 encryption and decryption.
  • the “media” key is in turn encrypted with the "main key, which is shown in the outermost circle or the outer surrounding shell.
  • This" main “key is used for the lifetime of the cryptographic module m.card. Assuming 4,000 to 10,000 "media” keys are issued to publishers annually, this key would be used approximately 40,000 to 100,000 times over a ten-year period of validity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Automation & Control Theory (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Storage Device Security (AREA)

Abstract

L'invention concerne un système et un procédé pour le codage et le décodage, la transmission et le stockage, protégés contre la copie et l'utilisation abusive, de supports électroniques audio et vidéo. L'invention vise à améliorer les systèmes et procédés existants en mettant en forme, modulant et codant les contenus d'information des supports électroniques de sorte que leur lecture ou leur représentation complète nécessite l'exécution de procédures de décodage cryptographiques chez le destinataire autorisé dans une étendue d'utilisation définie et de sorte qu'il est possible de définir dynamiquement, déjà au niveau du codage, dans quelle proportion réduire la qualité de représentation et de lecture et les possibilités d'utilisation en cas de non-exécution de telles procédures de décodage cryptographiques. A cet effet, les données électroniques audio et vidéo sont partagées dynamiquement en données de support et en données utiles non codées, en données de support et en données utiles codées, ainsi qu'en données de cryptomélodie et en données de clé contenant des clés, qui permettent et garantissent, avec efficacité quant au coût, l'utilisation conforme, notamment le stockage, la représentation et la lecture en temps réel, après une transmission et un décodage protégé chez le destinataire.
EP02806311A 2001-12-30 2002-12-03 Systeme et procede pour le codage et le decodage, la transmission et le stockage, proteges contre la copie et l'utilisation abusive, de supports electroniques audio et video Withdrawn EP1472692A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10164135A DE10164135A1 (de) 2001-12-30 2001-12-30 System und Verfahren zur kopier- und nutzungsgeschützten Ver- und Entschlüsselung, Übertragung und Speicherung elektronischer Ton- und Bildmedien
DE10164135 2001-12-30
PCT/DE2002/004420 WO2003060906A1 (fr) 2001-12-30 2002-12-03 Systeme et procede pour le codage et le decodage, la transmission et le stockage, proteges contre la copie et l'utilisation abusive, de supports electroniques audio et video

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DE10164135A1 (de) 2003-07-17
US20050005143A1 (en) 2005-01-06
AU2002357439A1 (en) 2003-07-30
WO2003060906A1 (fr) 2003-07-24

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