WO2008050112A1 - Stockage de contenu - Google Patents

Stockage de contenu Download PDF

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Publication number
WO2008050112A1
WO2008050112A1 PCT/GB2007/004041 GB2007004041W WO2008050112A1 WO 2008050112 A1 WO2008050112 A1 WO 2008050112A1 GB 2007004041 W GB2007004041 W GB 2007004041W WO 2008050112 A1 WO2008050112 A1 WO 2008050112A1
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WO
WIPO (PCT)
Prior art keywords
unlock
media player
content item
memory device
content
Prior art date
Application number
PCT/GB2007/004041
Other languages
English (en)
Inventor
Jeremy Mayo Boswell
Original Assignee
Rok Productions Limited
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 Rok Productions Limited filed Critical Rok Productions Limited
Publication of WO2008050112A1 publication Critical patent/WO2008050112A1/fr

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Classifications

    • 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]
    • 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
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
    • G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories

Definitions

  • This invention relates to a portable memory device having stored thereon content items, and to a method comprising storing content items on a portable memory device.
  • DRM digital rights management
  • a portable memory device having stored thereon: plural discrete content items, each of the content items being protected from playback by an authorised media player by a respective unlock code integrated into data constituting the content item; an unlock file, the unlock file including plural data records, each data record identifying one of the content items and including the unlock code for the content item; and a media player application, the media player application when executed by computing apparatus being operable in response to a determination that a content item is required to be played- back to locate the corresponding data record in the unlock file, to extract the unlock code for the content item from the data record, and to use the unlock code to playback the content item.
  • This is advantageous since it provides for protection of the content items from unauthorised copying.
  • the content items are able to be played-back only by the media player application stored on the memory device in the presence of the unlock file, it is not possible to playback any of the content items once they are separated from the media player application and/or the unlock 61e.
  • Each unlock code may be a function of a unique or quasi-unique mobile device identifier, such as an IMEI number. This is advantageous since it allows content playback to be limited to a mobile device which has the correct identifier.
  • the portable memory device may include a unique or pseudo-unique memory device identifier, and each unlock code may be a function of the memory device identifier. This is further advantageous since it provides for further protection of the content items from unauthorised copying.
  • the content items are able to be played-back only by the media player application stored on the memory device in the presence of the unlock file, and because the media player can refuse playback if the memory device identifier does not match the unlock code, it is not possible to playback any of the content items once they are separated from the media player application and/or the unlock file and/or the original memory device.
  • the media player application may includes a media player identifier, and each unlock code may be a function of the media player identifier. This is advantageous since it provides for still further protection of the content items from unauthorised copying. In particular, this prevents playback of any content items if the media player and the original memory device are separated from one another.
  • At least a majority of the unlock file stored on the portable memory device may be encrypted, and the media player application when executed by computing apparatus then is operable in response to a determination that a content item is requited to be played-back to decrypt the unlock file.
  • the media player application when executed by computing apparatus may be operable in response to a determination that a content item is required to be added to the memory device to store the content item on the memory device, and to modify the unlock file to include a data record corresponding to the new content item, and to store the modified unlock file. This is advantageous since it allows protected content items to be added to the memory device whilst maintaining the integrity of the protection of content items pre-existing on the memory device.
  • a method comprising: storing on a portable memory device plural discrete content items, each of the content items being protected from playback by an authorised media player by a respective unlock code integrated into data constituting the content item; storing on the portable memory device an unlock file, the unlock file including plural data records, each data record identifying one of the content items and including the unlock code for the content item; and storing on the portable memory device a media player application which is operable in response to a determination that a content item is required to be played- back to locate the corresponding data record in the unlock file, to extract the unlock code for the content item from the data record, and to use the unlock code to playback the content item.
  • the invention also provides a computer program comprising machine readable instructions which when executed by computing apparatus control it to perform a method of the invention.
  • Figure 1 is a systematic drawing illustrating a system in which the present invention is embodied
  • Figure 2 is a flow chart illustrating operation of some components of the Figure 1 system
  • Figure 3 is a systematic diagram illustrating contents of a portable memory device forming part of the Figure 1 system
  • Figure 4 is a flow chart illustrating operation of components of the system of Figure 1 in an alternative embodiment
  • Figure 5 is a flow chart illustrating operation of a media player application included in Figure 1.
  • a system 10 including a mobile device 11.
  • the mobile device 11 may be a mobile telephone, a smartphone, a personal digital assistant (PDA) or similar.
  • the mobile device 11 is able to communicate bidirec ⁇ onally with a mobile network 12 via a base station 13. Attached to the mobile network 12 is a billing server 14.
  • a mobile network 12 is also connected to the Internet 15.
  • a home computing device 16 which in this case is a personal computer (PC).
  • the PC 16 includes memory 17, on which is stored computer programs which control the PC to perform its functions.
  • a content server Also coupled to the Internet 18 is a content server, with which is associated a payment server 19.
  • the content server 18 and the payment server 19 are operable to provide content to users connected to the Internet 15 on receipt of suitable payment.
  • the mobile device 11 is a standard device. It includes a display 20, transmit and receive modules 21, a keypad 22 and a removable memory device 23.
  • the removable memory device is an MMC (MultdMedia Card), although any other suitable removable memory device may instead be used.
  • MMC Media Card
  • the mobile device 11 is able to write data to the MMC and is able to read data therefrom.
  • the mobile device 11 further is connected to the PC 16. This connection can take place in any suitable way, for instance using Bluetooth, wi-fi, a wired connection, infrared etc.
  • the PC 16 is connected to the Internet 15 and the mobile device 11 is connected to the PC 16, the mobile device is able to access the Internet 15 through the PC 16.
  • an application server 25 Also connected to the Internet 15 is an application server 25.
  • operation starts at step 30 when a user of a mobile device 11 accesses the content server 18 to initiate the sourcing of content.
  • the mobile device 11 determines whether or not a media player application is installed on the MMC 23. If a media application is not installed on the MMC 23, the mobile device 11 sources a media player application from the application server 25 at step 32, and installs it on the MMC 23.
  • the application server 25 is arranged to provide media player applications to any mobile devices requesting such.
  • Each media player application is different in that it includes a unique serial number, but is the same as every other media application provided by the application server 25 in every other way.
  • the media player application is installed on the MMC 23 directly by the mobile telephone 11. The media player application is not installed in any other part of the mobile device 11 or the PC 16.
  • the user subsequently pays for some content
  • the user may pay for content by sending an SMS including a content identifier to a premium rate number.
  • the user may pay for content using a browser application present on the mobile device 11. The content is paid for at step 33 in Figure 2.
  • the content server 18 Once content has been paid for, the content server 18 generates data constituting the content item and provides the content data with a digital fingerprint at intervals throughout the content data. This provides DRM on the content item. DRM prevents unauthorised playback of the content item. In particular, a media player application needs to be able to remove the digital fingerprint from the data before the content can be played-back.
  • the digital fingerprint and the manner in which it is inserted into the content item may be substantially the same as that described in GB-A-2,423,662, the contents of which are incorporated herein by reference.
  • the media player residing on the MMC 23 downloads and stores in the MMC 23 the content item, which includes digital fingerprints.
  • the media player application sources DRM information related to the item of content from the content server 18.
  • the media player application sources the digital fingerprint from the content server 18.
  • the media player application generates an unlock code for the content item.
  • the unlock code is a function of the digital fingerprint and a serial number of the MMC 23.
  • This serial number is a unique or pseudo-unique identifier which is associated with the hardware of the MMC.
  • Different MMC manufacturers include serial numbers at different locations in the MMC and in different ways. The skilled person will understand how to arrange the media player application as to read the serial number of the MMC 23 from the MMC.
  • the unlock code also is a function of the serial number of the media player application.
  • the exact function used to generate the unlock code is not essential to the invention. All that needs to be understood is that the media player application can use the unlock code to determine how to remove the digital fingerprint from the content item and determine that the unlock code relates to the MMC 23, according to its serial number.
  • the unlock code is a function also of the media player application, the unlock code should be such that the media player application can determine that the unlock code relates to itself.
  • the media player application decrypts an unlock file stored on the MMC 23, if an unlock file is stored there. If an unlock file is not stored on the MMC 23, at step 37 the media player application instead generates an unlock file.
  • the unlock file 52 includes a copy of the serial number of the MMC 23.
  • the media player application updates the existing or newly generated unlock file with the new content item.
  • the media player application generates a data record including a track filename, a delimiter and the unlock code, and adds the data record to the end of the unlock file.
  • the track filename is a text string which identifies the content item.
  • the track filename may be a name given to the track by the publisher optionally followed by a suffix indicating a format of the content item.
  • the delimiter may be a unique character, for instance #.
  • the unlock code is a function of the digital fingerprint, the serial number of the MMC 23 and optionally also a function of the serial number of the media player application.
  • the modified unlock file is encrypted and is saved into the MMC 23.
  • the media player application updates a File Allocation Table (FAT) which is included at the beginning of the MMC 23.
  • FAT File Allocation Table
  • the media player application determines whether more content is required. If more content is required, the operation proceeds again to step 34, where the next content item is downloaded and stored. If at step 41 it is determined that no more content is required, the operation proceeds to end at step 42.
  • the media player is run from the MMC 23. That is, the binary constituting the media player application is retained within the MMC, and uses cycles of a processor forming part of the mobile device 11 to perform its required functions.
  • the data obtained from the content server 18 and the application server 25 can be passed to the mobile device 11 through the Internet 15, the mobile network 12 and the base station 13, or alternatively can be passed through the Internet 15 and the PC 16.
  • Some operating systems used with mobile devices do not allow a media player application residing on an MMC to read a serial number of the MMC therefrom.
  • One example is the Symbian operating system.
  • the media player application instead uses some other data which is stored on the MMC.
  • the data used by the media player application must be data which is not modified during use of the MMC 23.
  • the data does not need to be unique to the MMC 23, but it is preferable that the data used by the media player application is unlikely to have the same bit sequence on another MMC. Such data may for instance be taken from a boot sector of the MMC.
  • Figure 3 a structure of the MMC 23 is shown.
  • Figure 3 is purely systematic, and shows an address of 0 at the left side, and increases to the address at the end of the volume size at the right side of the Figure.
  • a boot sector 50 is included at the beginning of the MMC 23.
  • a FAT 51 as is conventional.
  • an unlock file 52 is stored.
  • the media player application 53 is arranged to provide an empty space 60 at the end of the unlock file 52, so as to allow the unlock file 52 to grow in size without becoming fragmented.
  • the operation begins at step 70, where one or more applications are downloaded onto the PC 16 from the application server 25.
  • the downloaded applications are then installed on the PC 16.
  • the application installed on the PC 16 hereafter referred to as the PC application, connects the PC 16 to the mobile device 11 and performs a check as to the connectivity between PC 16 and the mobile device 11. Connection may be made in any suitable way, for instance using Bluetooth, wi-fi, infrared, or using a wired connection.
  • the user of the PC 16 registers with the content server 18 at step 72.
  • the user then makes a payment with the payment server 19, so as to provide an account balance with which to purchase content.
  • step 73 the user operates the PC 16 to select content which is desired to be loaded onto the MMC 23.
  • the PC application sources a media player application from the application server 25 and installs it directly onto the MMC 23.
  • the media player application is not installed on the PC 16 nor on the mobile device; instead, it is installed directly onto the MMC 23. If the PC application detects that an attempt is being made to install the media player application to another location, the downloading and installing process is halted.
  • the PC 16 sources the selected content from the content server 18 and stores it on the MMC 23.
  • die content provided by the content server is punctuated periodically with a digital fingerprint.
  • each item of content is provided with a different digital fingerprint. The location of the digital fingerprint may vary from content item to content item. This applies to all content items provided by the content server 18, including those referred to in the description accompanying Figure 2.
  • the PC application installs an unlock file on the MMC 23 at step 75.
  • the unlock file may be provided by the application server 25 or by the content server 18. Alternatively the unlock file may be generated by the PC 16.
  • the unlock file contains one data record for each of the content items. Each data records includes a track filename, a delimiter and an unlock code associated with the content item.
  • the result of the Figure 4 operation is the provision on the MMC 23 of a media player application, one or mote content items and an unlock file.
  • Each content item is detected by DRM, in this case a digital fingerprint.
  • the unlock file includes an unlock code for each of the content items.
  • the unlock file 52 is in encrypted form on the MMC 23. Encryption may be performed by the media player application, or an encrypted unlock file may be provided directly to the MMC 23.
  • the media player application modifies the unlock file to include an unlock code for each content item added to the MMC 23.
  • a content item is identified for playback. This may be for instance be a content item selected by a user from a list of content items which is available through a menu of the media player application. Alternatively, the content item identified for playback may be one which immediately follows a content item which currently is being played.
  • the unlock file 52 is decrypted by the media player application.
  • the media player application 53 checks that the serial number of the MMC 23 matches the MMC serial number stored as part of the unlock file. If there is no match, the operation terminates. This provides additional protection against use of data copied from the MMC 23 onto another MMC.
  • the media player application identifiers the data record in the unlock file which relates to the content item that was identified in step 80.
  • the media player application uses the unlock code to playback the content.
  • Step 83 includes validation of the content item, as follows.
  • the media player application firstly determines whether the unlock code is consistent with the serial number or other data which is unique or pseudo unique to the MMC 23. Depending on the function used to generate the unlock code, step 83 may or may not be able to reproduce fully the identifier or data from the MMC 23 used to generate the unlock code. However, the media player application is able to read the MMC serial number or other data and to determine when the unlock code is inconsistent with the read data. In the event of an inconsistency, the media player application shuts-down, so does not play back the content item identified in step 80.
  • the media player application furthermore verifies the unlock code with regard to the serial number of the media player application.
  • the media player application determines its serial number and makes a determination as to whether or not the unlock code is inconsistent with that serial number.
  • the media player application may not be able to reconstruct the serial number of the media player application used to generate the unlock code.
  • the media player application is able to recognise when the media player application serial number used to generate the unlock code is different to the serial number of the media player application making the determination. In the event of an inconsistency, the media player application closes down without playing-back the content item.
  • the media player application determines that the serial number of the MMC or other data found in the MMC is consistent with the unlock code and the serial number of the media player application is consistent with the unlock code, the media player application attempts to remove the digital fingerprint from the relevant content item.
  • the media player application uses the unlock code to determine where the digital fingerprint is located in the content item.
  • the media player application examines the data constituting the content item at the location so determined to identify the digital fingerprint which is present in the data.
  • the media player application determines whether this digital fingerprint is consistent with the unlock code. If there is any inconsistency between the digital fingerprint found in the data constituting the content item and the unlock code, then the media player application closes down and does not play back the content.
  • the media player application may just remove data from the location in the content item where it expects the digital fingerprint to be. If the removed data did not relate to a digital fingerprint, the media player application would crash when attempting to decode the data. This prevents the content being playable from a wrong unlock code.
  • the content item data is unable to be converted into a useable content item by a media player which is unable to extract the digital fingerprint data embedded within it, significant protection of the content is provided. Since the media player application will only play back the content if it has verified the digital fingerprint within the content item against an unlock code, the content item must be stored with the unlock code else it is not possible to playback the content item.
  • the unlock code a function of the serial number of the media player
  • playback of the content item by a different media player application becomes impossible or very difficult.
  • the content item necessarily is linked with the particular media player application (as identified by the serial number).
  • the content item is linked to the MMC 23, as identified by its serial number or by some other data included within it. Attaching the content item to the MMC 23 is particularly convenient since it allows the MMC 23 to be used with other mobile devices. Thus, for instance, the user may playback the content on their mobile device 11, and may then transfer the MMC 23 to a different mobile device for instance when upgrading the device. However, a copy of the data from the MMC 23 placed onto a different MMC would not be played-back since the media player application would identify that the serial number or other data on the MMC was inconsistent with the data used to generate the unlock code.
  • unlock file 52 relates to every content item which is stored on the MMC 23. This provides a relatively simple arrangement which simplifies the requirements of the media player application whilst providing relatively strong protection. In particular, the media player application need only handle one file whilst being able to obtain from that file all of the information needed to playback the content items.
  • the technique used to encrypt the unlock file 52 may take any suitable form. So as to provide stronger protection for the content items, the encryption technique may be one with a relatively long encryption key. Alternatively, the unlock file 52 may be encrypted with a relatively short key. The resulting encrypted file may then again be encrypted with the same or a different key. For additional security, the double- encrypted file may be encrypted once more, with the same or a different key.
  • the unlock codes do not include the digital fingerprint, so it is not possible to use the unlock codes to identify the bit sequence of the digital fingerprint in the content items.
  • the unlock code furthermore does not identify the location of the digital fingerprint.
  • the media player application is not installed on the mobile device 11.
  • the media player application may instead be installed on the mobile device 11. Indeed, this is a requirement of some operating systems, notably Symbian 3.
  • the media player application may be the installed version that is executed, or alternatively the media player application can be executed directly from the MMC 23.
  • the unlock code is a function of the serial number of the MMC 23, and optionally also a function of the serial number of the media player application. However, this is not essential. In other embodiments of the invention, as will now be described, the unlock code is not a function of any data unique or quasi-unique to the MMC 23. In the following, operation is the same as that described above unless stated otherwise. Repetition is omitted for the sake of conciseness. Further embodiments of the invention will now be described, again with reference to Figures 1 to 4.
  • the function used to generate the unlock code at step 36 of Figure 2 makes use of the IMEI number of the mobile device 11, as well as the digital fingerprint relating to the content item.
  • the IMEI International Mobile Station Equipment Identity
  • the IMEI is an identification number assigned to uniquely identify GSM mobile stations. It is a 15-digit serial number that contains a type approval code, a final assembly code and a serial number. * It is relatively straightforward for the media player application 53 to get the mobile device 11 to provide its IMEI.
  • the media player application can use the unlock code to determine how to temove the digital fingerprint from the content item and determine that the unlock code relates to the mobile device 11, according to its IMEI.
  • the unlock code need not be a function also of the media player application, but this is not precluded.
  • the media player application decrypts an unlock file stored on the MMC 23, if an unlock file is stored there. If an unlock file is not stored on the MMC 23, at step 37 the media player application instead genetates an unlock file.
  • the unlock file 52 includes a copy of the IMEI.
  • the unlock file 52 is decrypted by the media player application.
  • the media player application 53 checks that the IMEI stored in the MMC 23 matches the IMEI belonging to the mobile device 11. If there is no match, the operation terminates. This prevents the MMC 23 being used with devices other than the mobile device 23.
  • Step 83 includes validation of the content item, as follows.
  • the media player application firstly determines whether the unlock code is consistent with the IMEI of the mobile device 11. Depending on the function used to generate the unlock code, step 83 may or may not be able to reproduce fully the IMEI used to generate the unlock code. However, the media player application 53 is able determine when the unlock code is inconsistent with the IMEI. In the event of an inconsistency, the media player application shuts-down, i.e. terminates, so does not play back the content item identified in step 80.
  • the media player application verifies the unlock code with regard to the serial number of the media player application at step 83. In the event of an inconsistency, the media player application closes down without playing-back the content item.
  • the media player application determines that the IMEI of the host mobile device 11 is consistent with the unlock code, the media player application attempts to remove the digital fingerprint from the relevant content item. If there is any inconsistency between the digital fingerprint found in the data constituting the content item and the unlock code, then the media player application closes down and does not play back the content. Alternatively or additionally, the media player application may just remove data from the location in the content item where it expects the digital fingerprint to be. If the removed data did not relate to a digital fingerprint, the media player application would crash when attempting to decode the data. This prevents the content being playable from a wrong unlock code. The result of the above is protection of the content.
  • the content item data is unable to be converted into a useable content item by a media player which is unable to extract the digital fingerprint data embedded within it, significant protection of the content is provided. Since the media player application will only play back the content if it has verified the digital fingerprint within the content item against an unlock code, the content item must be stored with the unlock code else it is not possible to playback the content item.
  • the unlock code may use some other unique ox quasi-unique identifier attached to the host mobile device 11.
  • a content item is downloaded when purchased by a user.
  • the MMC 23 may be provided to the user with one or more content items pre-loaded thereon. These content items are ptotected by digital fingerprints, as described above, but the unlock file 52 does not include the unlock codes needed by the media player application 53 to playback the content.
  • a user can unlock content, thereby allowing the media player application to play it back, by purchasing an unlock code for the content.
  • This can occur in any suitable way.
  • the user may use a web browser, which may be standalone or may be integrated into the media player application 53, to purchase content. Once purchased, the user may be provided with a numerical ox alphanumerical string which, once entered into a text entry field of the media player application 53, unlocks the content item.
  • the content item may be unlocked automatically (i.e. without farther user involvement) by the sending of an SMS to the mobile device 11 which updates the media player application 53, or by the updating of the media player application 53 through WAP.
  • the media player application updates the unlock file with the unlock code for the new file as described above with reference to step 38 of Figure 2.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Technology Law (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

L'invention concerne un dispositif mémoire portable dans lequel sont stockés des articles de contenu, un fichier de déverrouillage et une application de lecteur multimédia. Chacun des articles de contenu est protégé contre la lecture par un lecteur multimédia autorisé au moyen d'un code de déverrouillage respectif intégré dans les données constituant l'article de contenu. Le fichier de déverrouillage comprend plusieurs enregistrements de données, chaque enregistrement de données identifiant l'un des articles de contenu et comprenant le code de déverrouillage pour l'article de contenu. L'application de lecteur multimédia peut fonctionner en réponse à une détermination selon laquelle un article de contenu est demandé en lecture pour situer l'enregistrement de données correspondant dans le fichier de déverrouillage, pour extraire le code de déverrouillage de l'article de contenu à partir de l'enregistrement de données, et pour utiliser le code de déverrouillage de façon à lire l'article de contenu.
PCT/GB2007/004041 2006-10-24 2007-10-23 Stockage de contenu WO2008050112A1 (fr)

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GBGB0621131.2A GB0621131D0 (en) 2006-10-24 2006-10-24 Content storage
GB0621131.2 2006-10-24

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CN102483778A (zh) * 2009-08-28 2012-05-30 索尼爱立信移动通讯有限公司 对移动设备应用的有效访问

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