WO2000055709A2 - Systeme de repartition, d'authentification et de localisation de donnees transmises numeriquement - Google Patents

Systeme de repartition, d'authentification et de localisation de donnees transmises numeriquement Download PDF

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Publication number
WO2000055709A2
WO2000055709A2 PCT/US2000/006875 US0006875W WO0055709A2 WO 2000055709 A2 WO2000055709 A2 WO 2000055709A2 US 0006875 W US0006875 W US 0006875W WO 0055709 A2 WO0055709 A2 WO 0055709A2
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WO
WIPO (PCT)
Prior art keywords
media
stamped
license
eli
broadcast
Prior art date
Application number
PCT/US2000/006875
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English (en)
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WO2000055709A3 (fr
Inventor
Christopher B. Muir
Christopher Van Rensburg
Thomas Morgan Dolby Robertson
Steven Hales
Original Assignee
Beatnik, Inc.
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 Beatnik, Inc. filed Critical Beatnik, Inc.
Priority to AU38878/00A priority Critical patent/AU3887800A/en
Publication of WO2000055709A2 publication Critical patent/WO2000055709A2/fr
Publication of WO2000055709A3 publication Critical patent/WO2000055709A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/12—Applying verification of the received information
    • H04L63/123—Applying verification of the received information received data contents, e.g. message integrity
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
    • H04L2463/101—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying security measures for digital rights management

Definitions

  • the present invention relates to a system for distributing, authenticating and tracking digital media, and, more particularly, a system in which the distributed digital media includes an authentication stamp that is usable for authentication and tracking purposes.
  • the reporting mechanism, approximation used, and the license fee owed will depend on the class of buyer to whom the work was sold, and other factors. As such, a radio station that repeatedly plays copyrighted works over the airwaves are monitored more closely than consumers who purchase a work solely for their own personal usage in their home.
  • U.S. Patent No. 5,790,664 describes a system for automatically tracking use of software and determining whether the software is validly licensed. A licensing server will then enable or disable a particular software application based upon whether that software application is validly licensed.
  • U.S. Patent No. 5,765,152 describes a system in which creators of works can create a digital media DOCUMENT that can include, in addition to the digital media, a document header, a document identifier and a digital signature. Potential licensees are given minimum level of permissions to review the DOCUMENT, and if desired to then license the
  • DOCUMENT are provided with an auxiliary permission data set that allows for the licensee to then use the DOCUMENT that has been licensed in various manners.
  • U.S. Patent No. 5,634,012 also describes a system in which an author is allowed to attach usage rights to the digital media that the author has created. These usage rights include a right code along with various conditions for exercising the right.
  • This invention attains the above objects, among others, by providing an Embedded License Information system, also referred to as an ELI system, in which embedded license information, and a network link such as a URL, that allows connection to a license authority, are disposed in ELI digital media files.
  • an ELI system in which embedded license information, and a network link such as a URL, that allows connection to a license authority, are disposed in ELI digital media files.
  • playing of an ELI media file using an ELI player will, upon connection of the ELI player to the communication network, generate a message to the license authority that has the potential to include information relating to I) the file that is or was previously played, II) the location, such as the particular website, that the ELI digital media file was obtained from, or III) the location from which the ELI digital media file is or was played.
  • Reports can then be generated to broadcasters and vendors using information collected by the license authority.
  • Figs. 1A and IB illustrate an overview of the embedded license information system according to one embodiment of the invention
  • Fig. 2 illustrates in further detail the ELI management system according to the one embodiment of the invention
  • Fig. 3 illustrates a flow chart of operation of the media broadcaster system according one embodiment of the invention
  • Fig. 4 illustrates a flow chart of operation of the media vendor system according to one embodiment of the invention
  • Figs. 5 A and 5B illustrate a flowchart of operations of a portion of the ELI management system according to one embodiment of the invention
  • Fig. 6 illustrates a flow chart of operation of the media receiver system that communicates with a portion of the ELI management system according to one embodiment of the invention
  • Fig. 7 illustrates one embodiment of the invention in the presence of a pirate media broadcasting system
  • Figs. 8A-8C illustrate various ELI stamped media formats according to one embodiment of the present invention
  • Fig. 9 illustrates another embodiment of the ELI system according to the invention
  • Fig. 10 illustrates one embodiment of the pending message database according to the invention
  • Figs. 11A and 1 IB illustrate message types that are transmitted between a media receiver and the ELI management system according to the invention
  • Fig. 12 illustrates a raw media format according to one embodiment of the invention.
  • Figs. 13A and 13B illustrate examples of reports for the media vendors and media broadcasters according to the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • the ELI system according to this invention is capable of collecting information that can be used to enable the accurate collection of usage royalties and statistics for media that is broadcast across computer networks. Furthermore, the ELI system also allows embedding of media licensee information inside the ELI digital media itself. As a result of the embedded information contained in the ELI media that is distributed, the present invention provides the ability to distribute, authenticate and track licensed ELI digital media. Accordingly, the ELI system according to the present invention can also detect unlicensed ELI media and take appropriate remedial measures. Central to the concept of the present invention is the notion that ELI-stamped media is a core commodity around which the entire ELI "Closed Loop" system is built.
  • FIGs. 1A and IB illustrates an overview of the ELI system 10 according to the present invention.
  • Fig. 1A illustrates those components associated with stamped preview media 40
  • FIG IB illustrates those components associated with stamped license media 30, as described further hereinafter.
  • the ELI system 10 includes as its four main components an ELI management system 100, a media vending system 200, a media broadcast system 300, and a media receiver system 400, each of which will be discussed in further detail hereinafter.
  • each of the systems 100, 200, 300 and 400 are computer networks, although it is intended that certain of these systems can be combined and have their functions be performed by the same computer.
  • systems 100 and 200 or 100, 200 and 300 could be combined on a single computer or cluster of computers and operate together as a single system.
  • these computer networks can and typically are independent of each other, capable of communicating over a communication network such as the Internet.
  • each of the systems 100, 200, 300 and 400 have components that are conventionally associated with computer systems, such as a processor, internal memory and interfaces, input devices such as keyboards and mice, output devices such as speakers, displays and printers, and the like.
  • each of these components has associated therewith particular software applications that allow for the implementation of the present invention as described herein. Which is not to say that certain software components cannot be implemented in hardware, but rather that the present implementation of the present invention is predominantly software that implements the features described herein using conventional hardware devices. It is anticipated that various vendors associated with systems 200, 300 or 400 will initiate activities that will result in the apparatus and methods according to the present invention being used. As an overview, however, with general reference to Figs. 1A and IB, in one specific embodiment, a media vendor will use the media vendor system 200 to forward each piece of raw media, which will contain digital media related to the work and associated information, from a raw media database 210 to the ELI management system 100.
  • the ELI management system 100 contains a license stamper 120 that will "stamp" the raw media and transmit the stamped media back to the media vending system 200 for storage in a stamped vendor media database 220 or transmission to a broadcaster system 300.
  • the stamped media can also be stored in a license database 160.
  • a pointer that can be used to identify the location of the digital media that is desired.
  • One type of raw media 20 that a vendor using system 200 will forward for stamping to system 100 is media that, once stamped, becomes stamped preview media 40 that can be forwarded to broadcasters owning systems 300 to preview.
  • the vendor can implement the distribution of preview media 40 in various ways, depending on the vendor's preference. It is possible, therefore, for each different piece of digital media to have associated therewith a single file of stamped preview media 40 that is stored in stamped media database 220 that can be distributed to different broadcasters 300.
  • broadcasters owning systems 300 can request a preview of digital media, and at that time the vendor of system 200 can have the requested digital media forwarded as raw media 20 to system 100 for stamping each time, and then forward the received stamped preview media 40 to the system 300 for review by the associated broadcaster.
  • the broadcaster will review the received preview media 40. If the operators of the media broadcast system 300 desire to broadcast the contents of the preview media 40, a request for a media license is then transmitted to the media vending system 200. If the request is granted, the media vending system 200 will then transmit further raw media 20 to the system 100, the raw media 20 will again include the digital media ( or a pointer to it as mentioned previously) and associated information related to the agreed upon license terms, as described further hereinafter. In response, system 100 will stamp this raw media 20 to obtain stamped license media 30, which is then received by vendor system 200, stored if desired in stamped media database 220, and then forwarded to broadcast system 300 for storage in a broadcast media storage 310. The media broadcast system 300 can then broadcast the obtained stamped license media 30 to potential users of it.
  • the recipients of the stamped license media 30 will each have a media receiver system 400 that includes a media receiver 410 for receiving the stamped license media 30, which media receiver 410 includes an ELI media player capable of reproducing the digital media in the appropriate format, such as sounds or images.
  • the media receiver system 400 also preferably contains a general purpose file system (not shown) for storage of various stamped license media 30 that it receives, such that when the media receiver system 400 is not connected to the network, the stamped license media 30 stored within the general purpose file system can still be enjoyed and experienced.
  • Playing of the stamped license media 30 by the ELI media player 420 will cause, as described further hereinafter, a message 50, also called a ping, to be delivered to the ELI management system 100, typically after the media has been played, or at some subsequent time, such as the next time that the media receiver system 400 is connected to the communication network or when a determined number of messages have accumulated, each message 50 indicating that a particular stamped license media 30 selection has been played.
  • the ELI manager 140 that is part of the ELI management system 100 uses the delivered message 50 to authenticate and track the media, as will be described in more detail hereinafter.
  • Figs. 8 A - 8C illustrate in a preferred embodiment the contents of ELI stamped media, which will now be described.
  • ELI stamped media can take the form of stamped preview media 40 or stamped license media 30. Both of these media types use the same format of ELI stamped media, but the fields will have different information contained therein due to the different usages of stamped media 30 and 40.
  • the stamped media 30 and 40 is obtained from raw media 20, which media is originally received by the license stamper 120 in a form illustrated in Fig. 12.
  • the stamped media 30 and 40 includes certain fields not contained in the raw media 20, in particular the License Number field in the preferred embodiment, which is added by the licensee evaluation module 124 as described hereinafter.
  • the raw media 20 contains fields not needed in the stamped media 30 and 40, particularly the Media Data
  • stamped media 30 and 40 is preferably encrypted, for example using an RSA encryption algorithm. While it is possible and most secure to encrypt the entire stamped media 30 and 40, it has been determined that the media data, licensor information and licensee information portions are the preferable minimum portions to be encrypted. Certain other portions of the stamped media 30 and 40, which particularly related to routing efficiency, need not be encrypted, such as router addresses and the like. With that overview of the media types transmitted between the various systems 100,
  • ELI-stamped media contains licensing and performance rights information designed to facilitate the tracking of broadcasting / performance of the media across a network.
  • An example of ELI-stamped media is illustrated in Figs. 8A-8C.
  • Each ELI-stamped media preferably includes ELI licensee information, ELI licensor information, ELI playback rules, General ELI information, and a media data block.
  • the fields that are preferably associated therewith include:
  • Vendor Network Address Provides the name of the vendor who is the licensor of the media, which vendor is typically the owner of the vendor system 200 according to the invention.
  • a Universal Resource Locator in the preferred embodiment of the present invention, which can be used to locate the vendor, who, as stated above, is typically the owner of the vendor system 200 according to the invention.
  • URL Universal Resource Locator
  • This field will, preferably, be a URL location associated with the broadcast system 300. Thus, if the URL that the media was actually received from does not match the URL specified in this field of the ELI-stamped file, then it can be determined that the media is pirated stamped media 80, as described further hereinafter, and the broadcast is considered illegal.
  • This field is used by the ELI media player 420 to determine if the license for the received stamped media is still valid and has not expired.
  • the owner of the media broadcast system 300 may obtain a license for a number of plays of the media, it may still be part of the license agreement between the owners of the media vending system 200 and the media broadcast system 300 that these licensed plays be used within a limited time period.
  • the balance between expiration date and licensed plays is best left to the pricing structures that the owner of the media vending system 200 believes is most appropriate for marketing the media.
  • This type of license would be well suited to an owner of a media broadcast system 300 that is planning an event, such as a competition, and the licensed media is only needed for the duration of this event.
  • the index number for an ELI-stamped file enables the ELI manager 140 to match an incoming ELI message that results from a stamped license media 30 being played by an ELI player 420 with the corresponding license record inside the license database 160. Because the index number is needed in order to make a conclusive match between an ELI message or ping and a license record, every unique ELI-stamped file from the same ELI management system 100 must have a unique ELI index number, which is obtained in the manner previously discussed, which license number is mirrored in the license database 160.
  • the ELI media player 420 In order for the ELI media player 420 to deliver each message 50 within its message database 430 to the ELI manager 140, as well as any messages 60 that may be required by ELI-stamped files as discussed hereinafter, the ELI media player 420 communicates with the ELI media player 420.
  • the ELI manager 140 has a CGI (Common
  • the ELI manager 140 location is the
  • the license usage field provides an indication of the medium in which the stamped media files can be used. For instance, if a broadcaster has usage rights for the World Wide
  • the digital media data stored in the Media Datablock is the data that makes up the work
  • the ELI stamper ID provides the identity of the application or hardware that created the stamped media.
  • the "Media Data Block MIME Type” field designates the type of digital media within the stamped media. This field is also written into the stamped media such that when the ELI Media Player decrypts and parses ELI-stamped Media, the
  • Media Data Block MIME Type field is used to determine what form of internal process should be used to perform the media. This mechanism is useful, especially for applications such as the World Wide Web, because browsers typically use the MIME type that is sent with the media across the Internet to determine which browser add-on component should deal with the media. Traditionally, this has caused problems with competing add-on components that may have support for overlapping media MIME types. Conflicts between shared MIME types are resolved by the browser and/or user, giving authors no reliable means of requiring that a particular player technology handle their media content.
  • the MIME type of the ELI wrapper will be "audio/rmf, but internally the .RMF file could contain data of varying media types, including "audio/midi”, “audio/aiff, “audio/wav”, “audio/basic”.
  • ELI playback rules are also contained within an ELI stamped media 30 or 40. These playback rules also contain fields, described hereinafter, which are used to assist in deter- mining whether a particular ELI player 420 should play a particular stamped media 30 or 40.
  • the stamped media 30 and 40 is obtained from the raw media 20.
  • Fig. 12 illustrates that format of the raw media 20. Most of the fields are the same as in the stamped media 30 and 40, and therefore need not be further described. Additional fields are, however, the Media Data Block Pointer field, the Stamped Media File Extension field and the Stamped Media MIME Type, which will be further described.
  • the stamped media file extension is necessary in order to transmit a stamped file across the network medium.
  • HTTP protocol has various different extensions, and the stamped media file will use an existing extension type, or another new extension could be implemented.
  • this field goes hand in hand with the "Stamped Media MIME
  • Stamped Media MIME Type is used by the ELI License Stamper in constructing the filename for the stamped media that is to be delivered to the Media Vendor 200, and is not actually stamped into the ELI file.
  • the "Stamped Media MIME Type" field represents the MIME type that is desired for the output of the ELI License Stamper 120. This MIME type is not stamped into the file, as such, but is used to send the stamped file across the network back to the Media Vendor 200.
  • the ELI Management Center 120 may also make a record of the MIME type and associated file extension for future reference. This information may be generally useful in observing the usage of MIME types by ELI-stamped media, and will help the ELI Management Center build a profile of the ELI Media Player technologies being developed.
  • the ELI Management Center is not only able to gauge the number of unique stamped media MIME types that are in use, correlating closely to the number of unique ELI Media Player technologies, but also the number of media types being supported and used for each of these player technologies.
  • Media Data Block Pointer The media data block pointer can be used to provide a pointer to a media data block that is not transmitted with raw media 20. Accordingly, in creating stamped digital media, as described hereinafter, media that is located on system 100, or in another location, can be located using this pointer information.
  • Fig. 10 illustrates another significant message type according to the present invention.
  • the typical end-user does not pay a fee for experiencing the associated media, much like a typical end- user does not pay a fee when listening to a radio station.
  • the user experiences the digital media associated with a stamped license media 30 there is the need to account for that usage, which accounting is performed by the ELI manager 140 collecting content that is delivered in a message 50 for each stamped license media 30 that has been played. Accordingly, playing such stamped license media 30 will ultimately cause, as described further hereinafter, a message 50 to be sent from the ELI player 420 to the ELI manager 140.
  • the message 50 contains, for each play of stamped license media 30, certain information that is contained within the associated stamped license media 30, such as the License Number, and also the time and duration of play, whether the play was legal or not, and the Broadcaster URL.
  • a message 50 can be sent for a single play of stamped license media 30, in which case the contents illustrated in one row of Fig. 10 will be transmitted.
  • a group of messages 50 as illustrated by a number of rows in the illustrated pending message database in Fig. 10, can be transmitted.
  • a different message is needed for each different ELI manager URL.
  • the appropriate message 50 is thus sent to the appropriate ELI manager URL, which network location is known due to the ELI manager field that exists within the stamped license media 30 and is associated with each play, as shown in Fig. 10.
  • the message 50 is also preferably encrypted, such that the ELI manager 140 decrypts the received encrypted message.
  • the ELI playback rules can require a message 60 to be sent by the ELI player 420 to the ELI manager 140, and that a response message 70 be received from the ELI manager 140 before initiating the playback of the stamped license media 30.
  • playback of the stamped license media may initiate, but also cause a message 60 to be transmitted to the ELI manager 140 by the ELI player 420, and a response message 70 can be received during playback instructing ELI player 420 to no longer play a particular stamped license media 30 (for instance if it was obtained illegally and detected as such as described hereinafter).
  • Messages 60 and 70 are illustrated in Figs. 11A-11B.
  • ELI management system 100 performs the overall administrative function that enables the tracking of performance statistics for any given ELI-stamped media.
  • the ELI management system 100 can be further broken down into two modules that cooperate with one another: the license stamper module 120, and the ELI manager module 140. Both of these modules share a common ELI license database 160 that contains the license information for all ELI-stamped media that is to be managed through the ELI management system 100.
  • the two modules need to be able to access and update the common database 160, whether this is done through a LAN (Local Area Network) or a WAN (Wide Area Network, such as the Internet).
  • LAN Local Area Network
  • WAN Wide Area Network, such as the Internet
  • the license stamper 120 is responsible for processing requests from media vending systems 200 to stamp raw media 20, preferably having content illustrated in Fig. 12, and deliver the stamped media 30 or 40, preferably having content such as illustrated in Figs. 8A-8C, back to the media vending system 200 if the request is successful.
  • Built into the transaction can be a service fee that is paid by the media vendor to the ELI management system 100 owner, which payment is preferably, but not necessarily, electronically implemented using conventional electronic banking systems that are built into each of the ELI management system 100 and each media vending system 200.
  • Fig. 2 illustrates the ELI management system 100 in more detail, which as previously mentioned contains three main components: the license stamper 120, the ELI manager 140, and the license database 160.
  • the license stamper 120 and the ELI manager 140 are preferably implemented as application software that is processed using the processor of a single or various computers that make up the system 100.
  • the license stamper 120 contains a request service module 122 that operates upon incoming raw media 20 from a media vending system 200.
  • the request service module 122 formats received raw media 20, so that the licensee evaluation module 124 can evaluate each.
  • the licensee evaluation module 124 determines if the required fields have been specified and, if so, approves the submitted raw media 20 and then associates a unique ELI index number with the other information in the raw media 20.
  • the licensee evaluation module 124 then initiates storage of at least certain of the license information, and, if desired, the digital media related to what will become the stamped preview media file 40 or stamped license media file 30, in the database 160.
  • the license portions of the preview media or license media is preferably stored in a license database 162, that is relationally related to performance database
  • the licensee evaluation module then passes the formatted raw media 20, with the respec- tively assigned ELI index number and the digital media being licensed, to the license stamper module 126, which operates upon the provided information to obtain the stamped preview media 40 or stamped license media 30, respectively.
  • the stamped preview media 40 and stamped license media 30 are preferably formatted in a way that makes it difficult to alter their contents, as described previously.
  • the stamped preview media 40 or stamped license media 30 is then transmitted back to the media vending system 200.
  • the report generator module 128 generates reports using data from the license database 160 for distribution to media vending systems 200 and media broadcasting systems 300, as described further hereinafter.
  • the ELI manager 140 includes a message gatherer module, which operates upon incoming messages 50 and 60 from any one of the various ELI media players 420 that are being used.
  • the message gatherer module 142 formats each received message so that it can be evaluated by the message processing module 144.
  • the message processing module 144 evaluates each message 50 to determine which stamped license media has been played and to record statistics related to such playing.
  • the message processing module 144 also has the ability to evaluate a message 60 that is used to determine whether a particular stamped license media can be played and return a message 70 to an ELI media player 420 indicating the same.
  • the message processing module 144 has the ability to evaluate whether a particular stamped license media has been illegally played using messages, and returns a return message to an ELI media player 420 indicating that the particular stamped license media should not be played again.
  • the ELI processing module 144 also cooperates with the database interface module 148 to store data related to each message 50 and 60 that is received by the ELI manager from an ELI media player 420 in the performance database 164.
  • Media Vending System 200
  • the media vending system 200 is used by vendors who desire to supply licensable media to broadcasters who wish to broadcast this media to an audience of receivers. As mentioned previously, media vending system 200 will cause stamped preview media
  • the stamped preview media 40 that is transmitted preferably contains content such as illustrated in Fig. 8A previously described. If a license to the content contained in the preview media 40 is desired, the media broadcast system 300 will be commanded to request a media license from the particular media vending system 200 that delivered the particular stamped preview media 40 of interest. If that license is granted, and upon payment of the license fee, stamped license media 30 that preferably contains content such as illustrated in Figs. 8B-8C, is transmitted to the media broadcast system 300.
  • the licensing including payment of the licensing fee, is preferably, but not necessarily, electronically implemented. Conventional electronic banking systems that are built into each of the media vending systems 200 and the media broadcast systems 300 can be used for that portion related to payment of the licensing fee.
  • a typical usage of a media vending system 200 would be within a business-to- business music portal where Web site developers can go to search for and locate music media, so that they can license and broadcast this media from the Web sites that they develop.
  • the Web site developers using a media broadcast system 300, would communicate with the media vending system 200 and cause a fee to be paid, preferably electronically, for a limited license to broadcast the music media.
  • the fee would, typically, be based upon a limited number of broadcasts by the media broadcast system 300.
  • the media broadcast system 300 is used by broadcasters who desire to deliver entertainment and/or information media to an audience across a computer network. Unlike conventional pay-per-play systems, the ELI system 10 focuses primarily on the media broadcast system 300 as the "customer" that will drive the economy behind ELI-stamped media. In other words, it is the broadcaster of the media who pays for each end-user who receives the broadcast and the end-user need not be responsible for paying license fees each time the content associated with a particular stamped media is experienced. Thus, the broadcaster system 300 will contain server components and player components, such that it can review stamped preview media 40 using the player components and distribute stamped license media 30 using the server components.
  • the player components correspond to the media receiver system 400, described hereinafter, and the server components correspond to the broadcast system 300 described herein.
  • the ELI system 10 is preferably implemented such that owner of the media broadcast system 300 is the customer in the ELI economy, the ELI system 10 does not preclude other financial models - such as pay-per-play - where the end-user is the customer driving the economy.
  • a pay-per-play model is achieved by combining the media broadcast system 300 and media receiver system 400 into one entity, as will be described hereinafter.
  • Media receiver system 400
  • the media receiver system 400 is the final component in the ELI system 10.
  • media receiver system is meant any device containing an ELI media player 420 that is capable of receiving and playing the ELI-stamped media so that an end-user can experience it.
  • the end-user would be a listener, and the media receiver system 400 would most typically be a Web browser that has the increased capability of playing ELI-stamped music media through an add-on component such as a plug-in or ActiveX control.
  • the ELI system 10 does not require that the media receiver system 400 be connected to the network for the user to use the ELI media player 420.
  • the media receiver system 400 and therefore the ELI media player 420
  • the media receiver system 400 will not be able to report all plays of ELI-stamped media to the ELI manager module 140 of the ELI management system 100.
  • an ELI media player 420 has the capability of counting all plays of ELI broadcast media 30 that have occurred while the media receiver system 400 is not connected to the network.
  • an ELI media player 420 it may not be deemed appropriate for the player to contact the ELI manager 140 every time that ELI-stamped media is played. In fact, even when the media receiver system 400 is online, one optimization is for the ELI media player 420 to accumulate information until such a time as a predetermined minimum number of backlog of plays has built up and report them all in a group of messages 50 sent at the same time. The accumulated reports that are stored inside the message database 430 can then be sent to the ELI manager 140 in one single connection, thus reducing network traffic and creating a smoother experience for the end-user. Of course, the needs of the end- user have to be balanced with the media vending system 200's needs for accurate up-to-the- minute data on playback.
  • Up-to-date information may also be considered essential for the owner of a media broadcast system 300 who is not willing to pay the owner of media vending system 200 for "overplays" that are generated by end-users who repeatedly experience media while offline without giving the ELI management system 100 any indication of usage status.
  • the message database 430 preferably contains a record corresponding to each piece of stamped license media 30 that has been played (according to the preferred embodiment) and not yet reported to the ELI management system 100.
  • the message database 430 preferably contains a record corresponding to each piece of stamped license media 30 that has been played (according to the preferred embodiment) and not yet reported to the ELI management system 100.
  • the playback rules can be set to prohibit usage of the stamped license media 30 even a single time.
  • Each record of the message database 430 preferably contains at least the following fields:
  • Broadcaster ID typically a URL
  • Time of Play includes date and time of day
  • the message database 430 may also contain additional information to gather, for example, statistical information on demographics of media popularity. With this information, reports can be generated, as described hereinafter, relating to the usage of each stamped license media 30 by end-users operating ELI players 420.
  • Figs. 3-6 each illustrate operation of the ELI system 10 from the perspective of the ELI management system 100, the media vendor system 200, the media broadcaster system 300, and the media receiver system 400, respectively.
  • Fig. 3 illustrates the steps of the preferred embodiment of the present invention from the perspective of an owner of broadcast system 300.
  • the media broadcaster browses preview media 40 after having sent a request for and received preview media 40 from a vendor system 200.
  • the broadcaster sends a request for a license of the preview media, and a response is received.
  • step 506 if that response does not grant a license, then further negotiations are needed or an alternate vendor needs to be sought.
  • step 508 follows, and the broadcast system 300 receives stamped license media 30, which is then downloaded into the broadcast system 300.
  • a transaction report described further hereinafter, is also received by the broadcast system 300 from the vendor system 200.
  • step 510 the broadcaster then integrates the downloaded stamped license media 30 into the broadcast media storage 310. Thereafter, the end step 512 follows, at which time the broadcaster will wait for user system 400 to access the broadcaster system 300 and request the stamped license media 30.
  • Fig. 4 illustrates the steps of the preferred embodiment of the present invention from the perspective of an owner of vendor system 200.
  • the vendor system 200 receives a request for a license of digital media from a broadcast system 300.
  • the broadcast system in step 552, causes to be forwarded to the ELI information system 100 information related to the broadcaster, and received back in step 554 information concerning the broad- caster.
  • step 556 the vendor decides whether to grant the license requested.
  • Step 558 retrieves the digital media content and related license information, and forwards it as raw media 20 to the ELI information system 100.
  • Step 560 follows, with the vendor receiving back either the stamped preview media 40 or the stamped license media 30 and an associated transaction information in a vendor transaction report, described hereinafter.
  • the vendor updates the license database 230 associ- ated with licensed media in step 562.
  • steps 564 and 566 the vendor forwards a broadcaster transaction report, described further hereinafter, to the broadcast system 300, as well as the stamped preview media 40 or the stamped license media 30.
  • Fig. 5 A illustrates the steps of the preferred embodiment of the present invention from the perspective of an owner of ELI information center system 100, and in particular from the perspective of the license stamper 120.
  • the license stamper 120 receives a request for stamping services from a vendor system 200.
  • this request is evaluated, and in step 606 an evaluation report is sent to the vendor system 200.
  • Step 606 follows and the system 100 waits for a response from the vendor system 200. If no license is requested, the transaction ends. If, however, the vendor desires a license, step 608 follows, and the license stamper 120 checks the license database 160 to determine if there is an existing license for this exact same media with this same broadcaster.
  • step 610 if there was not previously a license, then a license is created in step 612 and the license database 160 is updated with the new license. If it is not a new license, then step 614 follows, and the old license is updated. Whether step 612 or 614 occurred previously, then steps 616 and 618 follow, and a vendor transaction report, described further hereinafter, and the stamped media are then transmitted to the vendor system 200 for storage, if desired, in local license database 230 and stamped media database 220, respectively.
  • Fig. 6 illustrates the steps of the preferred embodiment of the present invention from the perspective of a user of an ELI player 420.
  • the media receiver 410 receives media from a broadcast system 300 and prepares for playback.
  • the media receiver 410 chooses the appropriate player module, such as a media player 420 that can decode a digital music recording.
  • a determination is made whether the received media is stamped license media 30. If not, then it is determined that it is media that can simply be played, and it is in the following step 658. If, however, it is stamped license media 30, then the ELI player 420 applies the ELI rules within the stamped license media 30 in step 660.
  • step 662 if the applied rules do not allow broadcast of the broadcast of the media, then step 664 follows and prescribed actions are taken, which actions may not allow for playback, or which may require a message 70 from the ELI information system 100. If the prescribed actions ultimately allow playback, this is decided in decision step 666, and playback results in step 668. If the prescribed actions do not ultimately allow playback, then the transaction stops. In step 668, the media is then played. There follows, in step 670, updating of the message database 430 with the information on the media that has just been played. Subsequently, the message 50 in the message database 430 is forwarded to the ELI information system, so that the ELI manager 130 can use the information within the message
  • Fig. 5B illustrates the steps of the preferred embodiment of the present invention from the perspective of an owner of ELI information center system 100, and in particular from the perspective of the ELI manager 140 when a message 60 (shown as a "confirmation request") must be received in order to initiate playback of the stamped license media 30.
  • the ELI manager receives a message 60 from an ELI media player requesting permission to play the stamped license media 30 it has received.
  • step 624 follows, and the ELI manager 140 parses the message 60 to obtain the data that it needs, and then step 626 follows, whereby a determination is made whether as to the data integrity and authenticity of the message 60.
  • ELI manager 140 uses a validation code to check the integrity of the message 60.
  • this takes the form of a hashing algorithm that is used to form a hash number from all data fields in the data packet, except the hash number data field.
  • the resulting hash number is compared with the hash number included in the message 60 to verify the data integrity and authenticity of the message 60.
  • Other types of validation codes can also be used, such as checksums, identifiers and the like.
  • Decision step 628 follows, which decides whether the message 60 is valid. If it is not, then step 630 follows and the ELI manager 140 logs information regarding the origin of the invalid message 60 and other information in the invalid message 60. Since there is no confirmation received by the ELI media player 420, the stamped media file 30 will not be played.
  • step 632 follows and the license number field is used to locate and retrieve the media license in the license database. If the license information is successfully retrieved, this is determined in decision step 634, and then step 638 follows, and the ELI manager 140 uses the data from the retrieved license to evaluate the data included in the message 60 and determine if performance of the stamped media 30 should be pe ⁇ nitted. Step 640 follows and the message 70 is compiled, thereafter being sent in step 642. If, in decision steps 634 the license is not successfully retrieved, then step 636 follows and the disparity is logged so that the problem can be pursued, and the disparity noted in generated reports. If the license is valid and retrieved, then regardless of whether play is permitted, a message 70 is sent containing the appropriate value for the
  • ELI-stamped media may contain an indefinite number of rules, in the form of a list of name/value pairs, preceded by a "count" field indicating the total number of ELI playback rules contained inside the media, as follows: ELI Playback Rules Structure
  • a particular set of playback rules that have been developed in order to implement the embodiments described above. These rules can, for example, require permission in order to play a particular stamped preview media 40 and stamped license media 30 and to prohibit further usage of illegally obtained stamped preview media 40 and stamped license media 30.
  • the following ELI playback rules allow for a variety of different behaviors, suitable for several different applications within the ELI economy. Different broadcasters of ELI- stamped media will most certainly have different agendas regarding the protection of their media.
  • the specific rules preferences chosen for ELI-stamped media may even be greatly different between different media that comes from the same media broadcaster. For instance, an original media vendor may choose to make some content available purely for promotional purposes. This content may have the most lax protection set inside the playback rules.
  • other media that this media vendor offers for preview on the e-commerce Web site may have very strong security specific in the ELI playback rules, since these files may represent the core revenue of the vendor and therefore should not be widely played unless originating from a valid licensed broadcaster.
  • the media broadcaster may want to agree that the stamped license media 30 be stamped with the rule prohibiting local system plays. This is because stamped license media 30 that is replayed off the local system may not then be broadcast in the context of the media broadcaster's overall site, and therefore the media broadcaster is not likely to gain the benefit that the media would otherwise contribute to the site.
  • the media vendor or media broadcaster may wish that each performance of a piece of ELI-stamped media be preceded by a request to the ELI management system 100 for permission to play, as discussed previously.
  • This transaction between the ELI media player 420 and ELI management system 100 is distinct from the transaction that takes place when the player delivers the contents of its message database 430 to the ELI management system 100.
  • This rule when set to "yes", does not of itself dictate that an acknowledgement be received before the media can start playing - it simply specifies that a request should be performed. When set to "yes”, the actual behavior is affected by the paired rule "ELI confirmation request behavior" described below. Because the message database scheme is geared towards optimizing the performance of the ELI system 10 and reducing the latency between the media downloading and beginning to play, having this rule set to "yes” may have a negative impact on the media broadcaster's site performance.
  • the media broadcaster may wish to be protected from such overplays. In this event, the rule would serve the interests of the media broadcaster well. In another situation, the media broadcaster may make it clear from the start that only a once-off limited play license is to be purchased and that the broadcaster has no intention of renewing this license when it expires.
  • this rule's setting may need to be involved in the media vendor's pricing structure, since the ELI management system 100 may charge a higher service rate to the media vendor for stamped license media 30 that is stamped with this rule set to "yes".
  • the stamped license media 30 it may be preferable to always play the stamped license media 30 - even in cases where an illegal condition has been recognized by the ELI media player 420. It has to be considered that the end-user experience of media not playing as anticipated could contribute to negative impressions of the media broadcaster, as well as the underlying player technology itself. Even if this rules is set to "yes", the ELI media player 420 will still be able to gather information regarding illegal broadcasting activities, which can then be compiled into reports for the media vendor and media broadcaster (valid licensee) and remedial actions may be taken.
  • This rule could vary significantly, depending on the exact nature of the business relationship between the media broadcaster and the media vendor. For instance, a media vendor may wish to provide the best and most accommodating service to its most valued elite clients. For such clients, the media vendor may never wish the media broadcaster to be embarrassed by licensed media failing to play, even if the license has expired. The media vendor may prefer to deal with these aspects of the licensing agreements "offline", with the aid of reports delivered from the ELI management system 100. The media broadcaster may have an arrangement with the media vendor to automatically renew licenses that have expired. In this case, it is best that the expiration not contribute towards an illegal condition in the ELI media player 420.
  • the license expiration may contribute to an illegal condition.
  • a media broadcaster who purchases a license for unlimited plays of a piece of media, but within a very restrictive timeframe.
  • the expiration date - rather than maximum- licensed plays - may be the condition that prohibits additional plays.
  • this rule will be set to its default value of "yes”.
  • promotional materials where the media broadcaster and/or media vendor may not care if the media is redistributed with greatity. Indeed, it may be in the best interest of the media vendor if this media is to be used to establish the media vendor's presence as a source of high quality media.
  • this rule is set to "no"
  • the ELI media player 420 would still gather information about the media origin and it would still be possible even if play is permitted, for the ELI management system 100 to provide reports to the media vendor and/or media broadcaster (valid licensee) detailing invalid broadcasting activities.
  • each transaction between the ELI management system 100 and a vendor system 200, or a transaction between a vendor system 200 and a broadcaster system 300 there is preferably an associated transaction report that includes certain details of the license that are contained in the stamped media and other details that are not contained in the stamped media. Since each media vendor system 200 and broadcaster system 300 will typically not have the capabilities to extract certain license information out of the ELI- stamped media, such license information, as well as other transaction information, is preferably supplied in a transaction report. This information is preferably supplied in both human-readable form, and database-ready format, although it may only be supplied in one form.
  • a vendor transaction report that is sent to a vendor will preferably contain information from the following fields: Vendor Name; Vendor URL; Vendor Phone; Vendor Fax; Licensed to URL; Expiration Date; License Number; ELI Manager URL; Use of License; ELI Stamper ID; Media Data Block MIME Type.
  • the vendor transaction report will contain information specific to the financial transaction process and not contained inside the corresponding ELI-stamped media, including the transaction fee (charge for license-stamping service) and transaction date (time when initial request from the vendor was received by the license stamper).
  • the media vendor system 200 may incorporate some or all of this data contained as part of the transaction report into its license database 230.
  • a broadcaster transaction report that is sent to a broadcaster, for instance during step 564 shown in Fig. 4, will preferably contain information from the following fields: Vendor Name; Vendor URL; Vendor Phone; Vendor Fax; Licensed to URL; Expiration Date; License Number; ELI Manager URL; Use of License; ELI Stamper ID; Media Data Block MIME Type.
  • the broadcaster transaction report will contain information specific to the financial transaction process and not contained inside the corresponding ELI-stamped media, including the transaction fee (cost of purchasing license to broadcast ELI-stamped media) and the transaction date (time when initial request from the broadcaster was received by the vendor).
  • the media broadcast system 300 may incorporate some or all of this data contained as part of the transaction report into its license database.
  • Reports As mentioned previously, the ELI system 10 according to the present invention needs to be able to disseminate in batch reports that are typically periodically provided the information collected by the ELI management system 100 to media vending systems 200 and media broadcasting systems 300 in order to reconcile license payments. These batch reports can then be reconciled with the transaction report information. Such reports are also needed to assist owners of media vending systems 200 to enforce protection of their media licenses, as well as helping to protect broadcasters of media using media broadcast system 300 from having their licensed media broadcast by another broadcaster illegally. Of course, not all information with the ELI management system 100 necessarily needs to be distributed to each media vending system 200 and media broadcasting systems 300.
  • the media vendor report illustrated in Fig. 13A contains information relating to the top illegal broadcasters of licensed media that originated from the vendor, the top legal broadcasters of licensed media that originated from the vendor, and a breakdown of information, as shown in each column, associated with each license that the particular vendor has entered into.
  • the media vendor report illustrated in Fig 13B contains information relating to the top illegal broadcasters of licensed media that originated from the broadcaster, an indication of licenses that will soon need to be renewed, and a breakdown of information, as shown in each column, associated with each license that the particular broadcaster has entered into.
  • the ELI management system 100 is responsible for generating these periodic statistical reports based upon the ELI information that is transmitted to the ELI manager 140 by each of the ELI media players 420.
  • the report data will also help both the owners of the media vending system 200 and media broadcast system 300 to gain some understanding of the tastes of end-users and to gauge the success of the media itself.
  • ELI media player 420 is required to evaluate the rights of the broadcaster to broadcast the ELI-stamped media.
  • Fig 7 illustrates how the ELI system 10 operates when a pirate broadcasting system 700 intercepts the stamped license media 30 for illegal rebroadcast without paying an appropriate license to the media vending system 200.
  • ELI media player 420 determines that the pirated media 80 is being illegally played using playback rules as described above and can then initiate various actions. It can, for example, provide a message 50 to the ELI management system 100 so that a vendor or broadcaster can take action. It can also initiate a sequence according to playback rules and transmits a message 60 that can result in the generation and transmission of a message 70 that prevents pirated media 80 obtained from a pirate media broadcaster system 700 from being played, thereby protecting the interests of all parties invested in the content economy. For example, on determining illegal play status, a report 90 can be issued alerting the media vending system 200 as well as the media broadcast system 300 of an illegal broadcast. The report 90 can also identify the origin of the illegal broadcast, thereby facilitating possible legal recourse. In addition to a report, it may be an option of an ELI-stamped file that it not be played if the broadcaster is not found to be a valid licensee of the media. ELI manager 140 Acknowledgement
  • stamped license media 30 can optionally be programmed to demand that an acknowledgement request be processed by the ELI manager 140 before the stamped license media 30 may be played.
  • a message 60 mentioned previously, will be delivered to the ELI Manager 140, and a return message 70 sent back indicating whether play can proceed. This can, for example, protect the media broadcast system 300 against "overplays" which the media vending system 200 may, depending on the financial nature of the license agreement, insist be chargeable transactions.
  • the ELI system 10 provides for the ELI manager 140 to validate incoming messages received from each ELI media player 420 and ensure that they are not being issued from a rogue ELI player 420.
  • the present invention provides for including a hash value with each message 50.
  • a complex hashing algorithm that is known only to the ELI management system 100 and certified ELI media players 420 thus allows the ELI manager 140 to invalidate virtually all rogue messages 50 that are received. Flushing the message database In order to be able to safely clear the contents of the message database 430, it is advantageous that the ELI media player 420 know whether the ELI manager 140 was able to successfully receive and process each message 50.
  • the ELI media player 420 preferably does not flush the message database 430 until a confirmation response is received from the ELI manager 140 indicative of the successful receipt and processing of the corresponding message 50.
  • the ELI media player 420 should preferably allow for the possibility that a message 50 that is sent is not successfully processed. Since a message 50 may need to resent, the present invention can also implement the confirmation message that will cause the ELI media player 420 to flush or clear the message database 430 of any messages 50. Accordingly, since messages 50 will not be flushed from the message database 430 until the confirmation response is received, if a confirmation response is not received within some interval of the initial message 50 being transmitted, a duplicate message 50 will be sent to the ELI manager 140 by the media player 420. Further, the ELI manager 140 should also be able to recognize incoming resent message 50 that may already have been processed. This is preferably accomplished using a unique hashed identifier for each message. This hashed identifier is preferably the same as the hash that is used to validate incoming messages 50 and identify rogue messages.
  • the ELI manager 140 will preferably store in the performance data section 164 of the license database 160 a list of ELI identifiers for all messages 50 that have been received. Each time a new message 50 is received, the identifier of the incoming message 50 will be looked up inside this list and, if present, the performance data from the incoming message 50 will not be reentered into the performance data section 164 of the license database 160.
  • ELI manager 140 in its response to the ELI media player 420, will send the confirmation response, as just previously described, indicating that the message 50 was processed. If the media player 420 is disconnected from the network before receiving the ELI manager 140's response, or for whatever other reason is not able to receive the confirmation response, then the player 420 will not flush the message database 430 and the message 50 (or groups of messages 50) will be resent again the next time the player 420 attempts to clear the message database 430. This process will be repeated until the player 420 is able to receive a confirmation response from the ELI manager 140 and then flush the message database 430. Pay-per-play
  • a pay-per-play financial model is not the focus of the ELI system 10, the ELI system 10 does also not preclude this financial model from being implemented.
  • a modified ELI system 800 illustrated in Fig 9, is preferably implemented.
  • the media vendor system 200 will contain digital media for distribution to potential pay per play viewers. Descriptions of the digital media available will be available, such that a decision can be made whether to request, obtain and thereby be able to experience the digital media work.
  • a pay per play viewer 840 which is essentially the media receiver system 400 described in earlier embodiments, is used to receive the stamped license media and allow the viewer to experience it.
  • the media gatherer module 830 is responsible for browsing and acquiring stamped license media 30 from a media vending system 200. In this embodiment, however, preview media 40 will not typically be provided. Rather, either the displays describing the work such as described previously will be available, or a short sample of the digital media that is requested may be available for viewing. Each time the user wishes to experience the entire work, the corresponding stamped license media 30 is then delivered, via the media gatherer module 830, to the pay per play viewer system 840.
  • the system 840 also includes offline media cache 850 (that corresponds to the previously mentioned general purpose file system) that stores the stamped license media 30. In this embodiment, the contents of the pending message database 430 accumulate while the pay per view player 840 is offline.
  • the contents of the pending message database 430 will be transmitted to the pending message reporter 860, which will then communicate with the ELI manager 140 as previously described to ensure that proper accounting takes place.
  • the contents of the pending message database can be transmitted directly to the ELI manager 140 as has been previously described.
  • the stamped license media 40 can be programmed in order to allow the viewer to experience it. For instance, payment may occur at the time the viewer, using the media gatherer, decides it would like to experience the work. The viewer will request a license using the media gatherer module 830, which license will be granted if the corresponding fee is paid. Accordingly, the stamped license media will be transmitted once payment is made, and will contain rules that permit, for example, one play. In this embodiment, the messaging described previously is not needed.
  • the contents of the pending message database can be forwarded to the pending message reporter 860 for reporting to the ELI manager 140 or to the ELI manager 140 directly from the pending message database 420.
  • Delivering messages through the pending message reporter 860 has particular utility when a number of different pay per play viewers 840 are associated with a single media gatherer module, such as in an arcade setting.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Storage Device Security (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Information Transfer Between Computers (AREA)

Abstract

La présente invention concerne un système d'informations incorporées concernant les droits d'utilisation, appelé également système ELI, dans lequel des informations incorporées concernant les droits d'utilisation et un lien de réseau, tel qu'un URL, qui permet une connexion avec un organe responsable des droits d'utilisation, sont placés dans des fichiers de données numériques à ELI. Par conséquent, la lecture d'un fichier de données à ELI à l'aide d'un dispositif de lecture d'ELI, lors de la connexion du lecteur d'ELI avec le réseau de communication, déclenche la production d'un message destiné à l'organe responsable des droits d'utilisation, ce message pouvant inclure des informations sur: 1) le fichier lu ou qui a été lu précédemment, 2) le lieu de diffusion, tel que le site web particulier à partir duquel le fichier de données numériques à ELI a été obtenu, et 3) le lieu où les données numériques à ELI sont ou ont été lues. Des rapports peuvent ensuite être produits à l'intention de diffuseurs et de vendeurs à l'aide des informations recueillies par l'organe responsable des droits d'utilisation.
PCT/US2000/006875 1999-03-17 2000-03-15 Systeme de repartition, d'authentification et de localisation de donnees transmises numeriquement WO2000055709A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38878/00A AU3887800A (en) 1999-03-17 2000-03-15 System for distribution, authentication and tracking of digitally transmitted media

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US27140799A 1999-03-17 1999-03-17
US09/271,407 1999-03-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0778512A2 (fr) * 1995-12-08 1997-06-11 Sun Microsystems, Inc. Système et méthode de gestion d'utilisation de logiciels d'application du type essai et achat
EP0851364A2 (fr) * 1996-12-24 1998-07-01 Koninklijke KPN N.V. Système de distribution de fichiers
EP0884669A2 (fr) * 1997-06-13 1998-12-16 Mitsubishi Corporation Système de gestion de données de droits d'auteurs avec une filigraine électronique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0778512A2 (fr) * 1995-12-08 1997-06-11 Sun Microsystems, Inc. Système et méthode de gestion d'utilisation de logiciels d'application du type essai et achat
EP0851364A2 (fr) * 1996-12-24 1998-07-01 Koninklijke KPN N.V. Système de distribution de fichiers
EP0884669A2 (fr) * 1997-06-13 1998-12-16 Mitsubishi Corporation Système de gestion de données de droits d'auteurs avec une filigraine électronique

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WO2000055709A3 (fr) 2000-12-28

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