WO2007076667A1 - Procede de gestion de droit numerique et systeme correspondant - Google Patents

Procede de gestion de droit numerique et systeme correspondant Download PDF

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Publication number
WO2007076667A1
WO2007076667A1 PCT/CN2006/002642 CN2006002642W WO2007076667A1 WO 2007076667 A1 WO2007076667 A1 WO 2007076667A1 CN 2006002642 W CN2006002642 W CN 2006002642W WO 2007076667 A1 WO2007076667 A1 WO 2007076667A1
Authority
WO
WIPO (PCT)
Prior art keywords
time
media file
timer
accumulated
current
Prior art date
Application number
PCT/CN2006/002642
Other languages
English (en)
Chinese (zh)
Inventor
Fenglei Wang
Zhefeng Yan
Fangshan Wang
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007076667A1 publication Critical patent/WO2007076667A1/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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2541—Rights Management
    • 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
    • H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
    • H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
    • 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
    • H04N21/4627—Rights management associated to the content
    • 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

Definitions

  • the present invention relates to digital rights management, and more particularly to a method and system for controlling the use of media objects in digital rights management.
  • Digital Rights Management DRM Digital Right Management
  • Digital Rights Management DRM Digital Right Management
  • the media content is encrypted and protected. After the device obtains the content decryption key, the device stores the key in the protected storage area of the device. When legally used, the content must be temporarily decrypted.
  • OMA Open Mobile Alliance
  • DRM defines a variety of ways to restrict content usage rights, such as: count, usage time, start time / end time, and so on.
  • the structure diagram of the DRM system is shown in Figure 1.
  • the DRM is mainly composed of three major functional entities: Content Issuer CI, Rights Issuer RI (Right Issuer) and DRM Client Agent Module (DRM agent) 0
  • CI is responsible for the distribution of content, encrypts the digital information and uploads it to the network
  • R1 is responsible for the distribution of the copyright object RO
  • the DRM agent is set as the executor of the local DRM management policy on the terminal device, and the user will encrypt the digital information.
  • the DRM Agent can use the content key in the RO to decrypt and obtain the plaintext of the content and use the content according to the rights in the RO.
  • the usage rights of the content include the number of uses or the time of use.
  • the core idea is to encrypt and protect the media object MO (Media Object), and the encryption key information is specially protected.
  • the key information and the usage rights of the content are securely encapsulated to form an RO, and only a legitimate user can obtain the R0. Content encryption key.
  • the limitation on the length of time used by the media object is limited by the accumulated play time, which represents the length of time allowed for the corresponding media object to be played.
  • the implementation is to define the accumulated attribute field on the RO, which represents the length of time allowed for the corresponding MO. If the following description exists:
  • the media object can play for 2 hours and 30 minutes.
  • the DRM client agent module (DRM agent) monitors and stops the playback of the video file as soon as the time is consumed.
  • the monitoring time is used to limit the accumulated time constraints.
  • the specific implementation manner of this constraint is not clearly defined, and one way may be: when starting to play, start the timer, during the playing process. Once the playback time is found to be equal to the allowed playback time, the playback will stop, and the time that can be played is updated to 0. Otherwise, the playback time can be changed after the end of the playback.
  • the above constraint is that the playback process is always performed normally. However, if an abnormal situation occurs during playback, such as when the mobile phone is low, the DRM agent does not have the opportunity to modify or record the current play time information. This viewing is not counted, users can use this vulnerability to create human anomalies during playback. In this case, the accumulated playback time value will not change, and users can use this method to watch repeatedly.
  • the present invention provides a method and system for controlling the use time of a media object in digital rights management to solve the problems in the prior art.
  • the first timer is started, and restarts after the timing is up, and the current accumulated playing time information of the media file is modified.
  • the current accumulated playing time information of the media file is the current remaining playing time
  • the method for modifying the current accumulated playing time information of the media file includes:
  • the first timer to its predetermined timing length, subtracts the timing length from the current remaining play time and saves the modified time information.
  • the current accumulated playing time information of the media file is the current remaining playing time. If the first timer is timed in an ascending order, when the media file stops playing within the allowed playing time, the accumulated time of the media file can also be played: The remaining allowed play time minus the timing of the first timer.
  • the current accumulated playing time information of the media file is the currently played time
  • the method for modifying the currently accumulated playing time information of the media file includes:
  • the first timer is added to the predetermined time length from the current played time, and the modified time information is saved.
  • the current accumulated playing time information of the media file is the current played time. If the first timer is in an ascending order, when the media file stops playing within the allowed playing time, the accumulated playing time of the media file is: currently played. Time plus the timing of the first timer.
  • the first timer timing length is set by the copyright issuer in the published rights object.
  • the method further includes: when starting to play the media file, starting to control the cumulative playback of the media file The second timer between.
  • a digital copyright management system comprising:
  • Digital rights agent for managing digital rights in terminals
  • the first timer is used to start when the player starts playing the media file, and after the timeout expires, the media file cumulative playing time information is modified, and the timing is restarted.
  • a second timer is also set in the digital rights agent for starting when the player starts playing the media file, and controlling the cumulative playing time of the media file.
  • the system further includes:
  • the cumulative time control module is configured to control the specific operation of the timer, including: starting, suspending, timing processing, processing calculation and closing operation of the time when the media file is accumulated and playable; and/or,
  • a player interface module configured to interact with the media player, obtain information about the player playing, pausing, and stopping operations, and transmit the information to the accumulated time control module;
  • a storage interface module for obtaining and saving corresponding information from the memory.
  • the present invention shortens the time interval for modifying the allowable play time by the cooperation of the first timer and the second timer, and effectively controls the user to watch multiple times by precisely modifying the play time.
  • FIG. 2 is a flow chart of time slice timing processing in an embodiment of the present invention.
  • FIG. 4 is a structural diagram of an apparatus according to an embodiment of the present invention.
  • the core idea of the present invention is to set more than one timer, and modify the current accumulated playing time information every other time period, shortening the time interval for modifying the accumulated playing time, and effectively avoiding the inaccurate modification of the allowed playing time in the prior art.
  • the current accumulated play time information includes: the current remaining allowable play time, or the elapsed time.
  • each time the first timer reaches its predetermined timing length the timing length is added from the current media file elapsed time and saved.
  • the current remaining allowed play time is modified as an example.
  • the specific implementation manner is as follows:
  • the time slice attribute field is added to the usage rule of the existing DRM description rights object, and the modification time interval of the media object cumulative play time is the time slice set in the rights object during the use of the media object.
  • Set a time slice attribute field timeslke in the copyright object to record the time slice size. For example, set a time segment to 3 minutes. From the start of playback, the DRM agent will modify the current remaining allowable play time every 3 minutes, even if an abnormal situation occurs. The length of time to reduce the recording can also be controlled within 3 minutes.
  • the selection of the time segment size is crucial. Since the size of each media file is different, the playing duration is different. Therefore, the size of the time segment can be determined by the copyright publisher when publishing the copyright object, according to the size of the media file or the playing time of the purchase. To make sure, for example, a 2 hour movie, the time slice can be set to 5 minutes. If it is a 5 minute movie, then setting the time slice to 1 minute is more appropriate. It should be noted that the size of the time slice is not necessarily smaller than the remaining allowable playback time.
  • the copyright object is a copyright object having an accumulated play time attribute.
  • the time slice timer (first timer) and the accumulated constraint time timer (second timer) are set by the DRM client proxy module, and the time slice timer is used to control the modification. Cumulative play time information. Specifically: After the playback starts, the time slice timer starts to work. If the time slice timer is in ascending order, when the time slice timer expires, the current allowed playback time is subtracted from the time slice value, and then the time slice is reset.
  • the timer when the reset time slice timer expires, re-modifies the current accumulated time that can be played again, and the specific modification manner is the same as the foregoing, and thus the cycle to the accumulated constraint time timer expires, and the modification can also accumulate the playback time. It is 0 and saved, and playback stops.
  • the time slice timer and the accumulated constraint time timer are both suspended; when the media object performs replay, the time slice timer and the accumulated constraint time timer are both again Start; When the user stops playing, the time slice timer and the accumulated constraint time timer are stopped.
  • the accumulated playable time can be modified and saved as follows: the current accumulated playable time value is subtracted since the last modification to The length of time at this time.
  • the duration of the time slice timer is a time slice size, which can be specified as: if the current allowed play time is less than the time slice length set in the copyright object, the time slice timer is set to the current allowable play time; otherwise, the copyright is set.
  • the duration of the accumulated constraint time timer is the time at which the current accumulation can also be played.
  • the initial value of the cumulative constraint time timer is the amount of playback time allowed before playback.
  • the above example shows that it can play for 2 hours and 30 minutes.
  • this constraint is implemented as follows: When starting playback, the timer is started, if the time slice timer is counted in ascending order, once it is found during playback. When the playing time is equal to 2 hours and 30 minutes, the playback will stop. Otherwise, after the time of playing a time slice, the time that can be played can be modified.
  • the specific method is to subtract the current time slice by the current allowed playing time of 2 hours and 30 minutes.
  • the above example shows that it can play for 2 hours and 30 minutes, and the time slice size is 5 minutes. That is to say, every 5 minutes after the start of playback, the DRM agent will update the current remaining playback time, which is the original value minus one time. Slice size, which is 5 minutes, during this process, if an abnormal shutdown occurs, reduce the record time The length between the two is also controlled within 5 minutes, which more effectively ensures the accuracy and authenticity of the accumulated time calculation.
  • the time modification interval can be reduced, but when the playback is stopped, there is a certain interval between the last modification and the allowable playback time, and this interval needs to be considered.
  • the allowable playback time is 12 minutes
  • the accumulated time timer is set to 12 minutes
  • the time slice timer is set to 5 minutes. If the playback stops when the 11th minute is played, the time in the accumulated time timer is 2 minutes, and the timing is not reached; the time in the time slice timer is 1 minute (false setting value is incremented by 0 every time period) To the time slice size), the timing has not yet arrived. At this time, the playback time will be 2 minutes. Compared with the actual situation, 1 minute has not been recorded in the already played time.
  • the solution at this time can be: Calculate the allowable play time in the current accumulated time timer minus the time in the time slice timer when the play time is allowed.
  • the apparatus for implementing a cumulative constraint time condition in the digital rights management system of the present invention mainly includes: a first timer, a second timer, and a player. Interface module, storage interface module and cumulative time control module.
  • the player interface module is configured to implement interaction with the media player, and obtain operation information such as player playback, pause, and stop;
  • the storage interface module is configured to acquire and save current status information of the corresponding rights information or rights from the memory.
  • the main time is to read the accumulated playable time, the currently playable time, and the time slice value, and modify Save the information after the current playable time.
  • the cumulative time control module is configured to implement control of overall logic of the device according to information acquired by the player interface module and the storage interface module, and mainly controls startup, suspension, timing, processing of the accumulated time, and shutdown of the timer. Operation, the timer is a time slice timer and a cumulative constraint time timer.
  • the accumulated time control module senses a user operation signal transmitted by the player interface module, the accumulated time control module triggers a timer start in time. Pause or stop timing.
  • the time slice timer is timed, the accumulated time control module modifies the current accumulated play time information, and at the same time saves the modified data through the storage interface module, and then resets the time slice timer.
  • the accumulated constraint time timer is timed, the accumulated time control module modifies the current accumulated play time to 0, and saves the modified data through the storage interface module, and stops playing.
  • the user downloads the encrypted digital content information to the DRM Agent. If the user wants to use the downloaded digital content information, the user needs to request the copyright object (RO) of the digital content information product from the copyright issuer RI, and the RO includes the secret of the decrypted content data. key. If it is a one-time paid product, the DRM Agent can use the key to decrypt the digital content information, and the user can use it; if it is necessary to limit the cumulative playing time of the user operation, the RO should also include the accumulation of the digital content information. Playing time limit information, the storage interface module reads the above cumulative play The time related information is implemented by the accumulated time control module according to the accumulated play time limit information.
  • RO copyright object
  • adding such a cumulative play time for controlling the execution time condition can more effectively control the content play time to ensure the accuracy and authenticity of the accumulated time calculation.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • Technology Law (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Storage Device Security (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

Procédé de contrôle de durée de service d'objet multimédia en gestion de droit numérique. Par rapport au système de gestion de droit numérique original, on ajoute un compteur de tranche de temps à l'objet de droit qui a accumulé une limite de durée de lecture. Il est possible d'optimiser le système de gestion de droit numérique par le contrôle commun de ce compteur et du compteur de durée de lecture accumulée, et le droit numérique du détenteur de droit d'auteur est protégé. Egalement, système de contrôle correspondant pour le contrôle de la durée de service d'objet multimédia en gestion de droit numérique
PCT/CN2006/002642 2005-12-30 2006-10-10 Procede de gestion de droit numerique et systeme correspondant WO2007076667A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB2005101214600A CN100461198C (zh) 2005-12-30 2005-12-30 一种数字版权管理方法及装置
CN200510121460.0 2005-12-30

Publications (1)

Publication Number Publication Date
WO2007076667A1 true WO2007076667A1 (fr) 2007-07-12

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PCT/CN2006/002642 WO2007076667A1 (fr) 2005-12-30 2006-10-10 Procede de gestion de droit numerique et systeme correspondant

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CN (1) CN100461198C (fr)
WO (1) WO2007076667A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101089870B (zh) * 2007-07-25 2010-06-02 中兴通讯股份有限公司 选择drm系统中多个版权对象的最优对象的装置和方法
CN101364250B (zh) * 2007-08-08 2011-06-08 深圳华为通信技术有限公司 一种版权信息处理方法及设备
CN103186721B (zh) * 2011-12-28 2016-03-09 北大方正集团有限公司 数字版权服务控制方法、装置及系统

Citations (3)

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Publication number Priority date Publication date Assignee Title
US20020169974A1 (en) * 2001-03-01 2002-11-14 Microsoft Corporation Detecting and responding to a clock rollback in a digital rights management system on a computing device
US20030233553A1 (en) * 2002-06-13 2003-12-18 Microsoft Corporation Secure clock on computing device such as may be required in connection with a trust-based system
US20050114896A1 (en) * 2003-11-21 2005-05-26 Hug Joshua D. Digital rights management for content rendering on playback devices

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1592207A (zh) * 2003-09-02 2005-03-09 华为技术有限公司 预付费卡号同时使用的实现方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020169974A1 (en) * 2001-03-01 2002-11-14 Microsoft Corporation Detecting and responding to a clock rollback in a digital rights management system on a computing device
US20030233553A1 (en) * 2002-06-13 2003-12-18 Microsoft Corporation Secure clock on computing device such as may be required in connection with a trust-based system
US20050114896A1 (en) * 2003-11-21 2005-05-26 Hug Joshua D. Digital rights management for content rendering on playback devices

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Publication number Publication date
CN1858767A (zh) 2006-11-08
CN100461198C (zh) 2009-02-11

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