WO2002023315A9 - Systeme destine a la gestion des droits, permettant la lecture de contenu numerique en ligne - Google Patents
Systeme destine a la gestion des droits, permettant la lecture de contenu numerique en ligneInfo
- Publication number
- WO2002023315A9 WO2002023315A9 PCT/US2001/026495 US0126495W WO0223315A9 WO 2002023315 A9 WO2002023315 A9 WO 2002023315A9 US 0126495 W US0126495 W US 0126495W WO 0223315 A9 WO0223315 A9 WO 0223315A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- license
- content file
- content
- key
- playback
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 12
- 238000012545 processing Methods 0.000 description 8
- 238000009826 distribution Methods 0.000 description 6
- 230000002452 interceptive effect Effects 0.000 description 6
- 238000007726 management method Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
-
- G—PHYSICS
- 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]
- G06F21/107—License processing; Key processing
-
- 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]
- G06F21/108—Transfer of content, software, digital rights or licenses
- G06F21/1083—Partial license transfers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2541—Rights Management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/633—Control signals issued by server directed to the network components or client
- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
- H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2107—File encryption
Definitions
- This invention relates to the field of information processing and more particularly to systems for implementing digital management rights.
- Encryption is the conversion of data into an unintelligible form, e.g., ciphertext, that cannot be easily understood by unauthorized users.
- Decryption is the process of converting encrypted content back into its original form such that the it becomes intelligible.
- Simple ciphers include the rotation of letters in the alphabet, the substitution of letters for numbers, and the "scrambling" of voice signals by inverting the sideband frequencies. More complex ciphers work according to sophisticated computer algorithms that rearrange the data bits in digital information content. In order to easily recover the encrypted information content, the correct decryption key is required.
- the key is an algorithm that decodes the work of the encryption algorithm.
- PKS Public Key Systems
- asymmetric systems which utilize two different keys, one for encryption, or signing, and one for decryption, or verifying; and (2) nonpublic key systems that are known as symmetric, or secret key, systems.
- a system for managing rights to a content file within a computer network permits streaming and allows an authorized user to play back the content file while the user is online.
- the system comprises a key for decrypting the content file, a license which contains the key for authorizing decryption and playback of the content file and a header which contains information relating to a name for the license, identification of the content file, and a URL (uniform resource locator) of the server.
- a content module encrypts the content file, removes a portion of the content file and substitutes the header thereof.
- a user's computer system receives the content file and the license via a communication network.
- a decoder module decrypts the content file using the key, which is contained within the license.
- a license data generator generates a machine identification to which the license is bound so that the content file is playable only on the designated machine.
- the system further includes a core module for retrieving the identification information from the license data generator, a license database for storing the license when received, and a content player which plays back the content file when it is unencrypted. In this manner, the present invention permits both playback of the content file and management of the corresponding rights to the content file without the disadvantages associated with the related art.
- the present invention provides a system for encrypting a content file within a computer network for on-line playback.
- the system comprises a first key for decrypting the content file and a header which contains information that allows playback of the content file.
- Other components include a key module for generating the first key, and a content module for encrypting the content file, and for removing a first content portion of the content file and substituting the header thereof.
- Fig. 1 A is an illustration of computer system 1 including display 3 having display screen 5.
- Fig. IB illustrates subsystems that might typically be found in a computer such as computer 1.
- Fig. 1 C is a generalized diagram of a typical network.
- Fig. 2 is a block diagram of a zipLock system for encrypting content files according to the present invention.
- Fig. 3 is a schematic block diagram of a zipLock delivery system for delivering encrypted content to an end user disk.
- Fig. 4 is a schematic block diagram of a zipLock system for enabling playback of content files according to the present invention.
- Fig. 5 is a block diagram of a zipLock system for acquiring a license which authorizes a user to playback a content file.
- a system for managing the rights to one or more digital content , files within a computer network, and for permitting the on-line playback of such content files by an authorized user In order to manage these rights, the system encrypts the content files to prevent unauthorized access to the files. Encryption is accomplished by using one or more keys which are associated with one or more segments of the content file. These keys enable an authorized user to decrypt and playback the content files at a subsequent time. Upon receiving the keys, an end user's system retrieves a license from a license server which specifies the rights of the user as it relates to the content files.
- the present system manages digital rights pertaining to such content files in accordance with one embodiment of the present invention.
- the present invention will be further understood with reference to the diagrams and descriptions which follow.
- Fig. 1 A is an illustration of computer system 1 including display 3 having display screen 5.
- Cabinet 7 houses standard computer components (not shown) such as a disk drive, CDROM drive, display adapter, network card, random access memory (RAM), central processing unit (CPU), and other components, subsystems and devices.
- User input devices such as mouse 11 having buttons 13, and keyboard 9 are shown.
- Other user input devices such as a trackball, touch-screen, digitizing tablet, etc. can be used.
- the computer system is illustrative of but one type of computer system, such as a desktop computer, suitable for use with the present invention.
- Computers can be configured with many different hardware components and can be made in many dimensions and styles (e.g., laptop, palmtop, pen top, server, workstation, mainframe). Any hardware platform suitable for performing the processing described herein is suitable for use with the present invention.
- Fig. IB illustrates subsystems that might typically be found in a computer such as computer 1.
- subsystems within box 20 are directly interfaced to internal bus 22.
- Such subsystems typically are contained within the computer system such as within cabinet 7 of Fig. 1A.
- Subsystems include input/output (I/O) controller 24, System Random Access Memory (RAM) 26, Central Processing Unit (CPU) 28, Display Adapter 30, Serial Port 40, Fixed Disk 42 and Network Interface Adapter 44.
- I/O input/output
- RAM System Random Access Memory
- CPU Central Processing Unit
- Display Adapter 30 Serial Port 40
- Fixed Disk 42 Fixed Disk 42
- Network Interface Adapter 44 The use of bus 22 allows each of the subsystems to transfer data among the subsystems and, most importantly, with the CPU.
- External devices can communicate with the CPU or other subsystems via bus 22 by interfacing with a subsystem on the bus.
- Monitor 46 connects to the bus through Display Adapter 30.
- a relative pointing device (RPD) 48 such as a mouse connects through Serial Port 40.
- Some devices such as Keyboard 50 can communicate with
- Fig. IB is illustrative of but one suitable configuration. Subsystems, components or devices other than those shown in Fig. IB can be added. A suitable computer system can be achieved without using all of the subsystems shown in Fig. 1. For example, a standalone computer need not be coupled to a network so Network Interface 44 would not be required. Other subsystems such as a CDROM drive, graphics accelerator, etc. can be included in the configuration without affecting the performance of the system of the present invention.
- Fig. 1C is a generalized diagram of a typical network.
- the network system 80 includes several local networks coupled to the Internet. Although specific network protocols, physical layers, topologies, and other network properties are presented herein, the present invention is suitable for use with any network.
- Fig. 1C computer USER1 is connected to Serverl .
- This connection can be by a network such as Ethernet, Asynchronous Transfer Mode, IEEE standard 1553 bus, modem connection, Universal Serial Bus, etc.
- the communication link need not be a wire but can be infrared, radio wave transmission, etc.
- Serverl is coupled to the Internet.
- the Internet is shown symbolically as a collection of server routers 82. Note that the use of the Internet for distribution or communication of information is not strictly necessary to practice the present invention but is merely used to illustrate a preferred embodiment, below. Further, the use of server computers and the designation of server and client machines is not crucial to an implementation of the present invention.
- USER1 Computer can be connected directly to the Internet.
- Serverl 's connection to the Internet is typically by a relatively high bandwidth transmission medium such as a TI or T3 line.
- computers at 84 are shown utilizing a local network at a different location from USER1 computer.
- the computers at 84 are coupled to the Internet via Server2.
- USER3 and Server3 represent yet a third installation.
- a server is a machine or process that is providing information to another machine or process, i.e., the "client,” that requests the information.
- a computer or process can be acting as a client at one point in time (because it is requesting information) and can be acting as a server at another point in time (because it is providing information).
- Some computers are consistently referred to as “servers” because they usually act as a repository for a large amount of information that is often requested. For example, a World Wide Web (WWW, or simply, "Web”) site is often hosted by a server computer with a large storage capacity, high-speed processor and Internet link having the ability to handle many high-bandwidth communication lines.
- WWW World Wide Web
- a server machine will most likely not be manually operated by a human user on a continual basis, but, instead, has software for constantly, and automatically, responding to information requests.
- some machines such as desktop computers, are typically thought of as client machines because they are primarily used to obtain information from the Internet for a user operating the machine.
- the machine may actually be performing the role of a client or server, as the need may be.
- a user's desktop computer can provide information to another desktop computer.
- a server may directly communicate with another server computer.
- this is characterized as "peer-to-peer,” communication.
- processes of the present invention, and the hardware executing the processes may be characterized by language common to a discussion of the Internet (e.g., "client,” “server,” “peer") it should be apparent that software of the present invention can execute on any type of suitable hardware including networks other than the Internet.
- software of the present invention may be presented as a single entity, such software is readily able to be executed on multiple machines. That is, there may be multiple instances of a given software program, a single program may be executing on two or more processors in a distributed processing environment, parts of a single program may be executing on different physical machines, etc. Further, two different programs, such as a client and server program, can be executing in a single machine, or in different machines. A single program can be operating as a client for one information transaction and as a server for a different information transaction.
- a first embodiment of the present invention is incorporated into a product called "zipLock”TM available from a primary company Preview Systems, Inc.® of Sunnyvale, California.
- Fig. 2 is a block diagram of zipLock system 200 for encrypting content files according to the present invention.
- content refers to digital information.
- system 200 comprises content builder module 216 for encrypting one or more digital files, DRM encoder 210 for coordinating encryption as well as providing a header, DRM key module 212 for associating the information contained within a content file with a license, and zipLock database 202 for storing key sheaves received from content builder 212.
- content builder 216 receives a single unencrypted content file 206 (or multiple unencrypted content files 208) for encryption.
- Content files 206 may be a musical recording, an audio or video image, which may be from third party sources or directly from the content providers.
- content builder 216 utilizes an encryption algorithm to implement the encryption process. In one embodiment, this process is accomplished by segmenting content file 206 into variable segments, each segment being encrypted with a separate key.
- a "key” may be a variable value that is applied to content file 206 using an algorithm to produce encryption text.
- a single key or multiple keys having constant or variable lengths may be employed depending on which embodiment is implemented.
- the keys are saved in zipLock database 202 for later retrieval during the playback process.
- database 202 is an industry standard database system such as Oracle 8TM available from Oracle, Inc.
- Content builder 216 also functions to interact with database 202 to create the necessary information to enable the sale, distribution and tracking of the content within system 200.
- content builder 216 removes a portion of content file 206 and in its place inserts a header (not shown), supplied by DRM encoder 210.
- the removed portion is thereafter added to a license file for authorizing playback of the content file 206. Therefore, the removed portion is considered part of the keys.
- the removed portion may be added to a pre-configured license, the terms of which are predefined. During the playback process, the pre-configured license is then retrieved when its terms are the same as the user's transaction.
- the removed portion may be saved and later added to a license which is generated on the fly during the playback process. In any event, once the license is obtained, the removed portion is thereafter recombined with the original content portion during the playback process.
- removing a portion of content file 206 also provides a measure of extra security as the removed portion of content file 206 remains unavailable until decryption time. Therefore, copying encrypted content to another machine is completely useless without the back binding license.
- a further reason for removing a portion of content file 206 to accommodate the header is to keep the content file the same length as the original file. In this manner, the process of seeking a specific location in content file 206 during the decryption process is simplified.
- the header within content file 206 contains information fields such as the license name, the content file identification, and the license server URL (uniform resource locator).
- the license name field enables content file 206 to be associated with the license file (containing the removed content portion).
- the content identification field identifies the content file 206 while the license server URL points to the address of the license server where the license is generated (or located).
- the header may contain multiple fields for identifying various types of information other than those referenced above.
- Fig. 3 is a schematic block diagram of zipLock delivery system 300 for delivering encrypted content 304 to an end user disk 310.
- delivery system 300 includes content server 302 for generating encrypted content 304, interactive web player 312 and DRM proxy 308 which provides an alternate means for retrieving encrypted content 304 from server 302.
- system 300 functions in an on-line mode. In this mode, content 304 remains on content server 302 and is streamed when requested by the user. That is, content 304 is played back as it arrives on disk 310.
- One method of achieving this functionality is by using a separate module such as DRM proxy 308 for retrieving the content from content server 302, using a receipt 306. It should be noted that DRM proxy 308 is separate and apart from content player 312 because frequent modifications to the module may be carried out as proves necessary, without modifying other components.
- a module which functions as part of the content player 312 may carry out the streaming functionality.
- Examples of content players which are currently available on the market are Quicktime 4TM available from Apple Computer, Inc.®, RealPlayerTM available from RealNetworks, Inc.® and Shockwave 7TM available from MacroMedia, Inc.®.
- the license is delivered concurrently with content 304.
- Fig. 4 is a schematic block diagram of zipLock system 400 for enabling playback of content files 404 according to the present invention.
- system 400 allows only authorized users to playback content files in accordance with one embodiment.
- System 400 comprises content server 402, among other components, for downloading content files 404 to content player 408 for the purpose of allowing playback of the content files.
- content player 408 begins by retrieving a chunk of content from content files 404, each file including a content header (described in Fig. 2) for identifying a license name, a content identification, and a license server URL among other information. Thereafter, the chunk of content is handed over to player module 410, which begins to coordinate the decryption of content files 404.
- Player module 410 contacts DRM core 414 to request a session key for decrypting the content files. Because the requested key is contained within a license, DRM core 414 must identify the appropriate license and its current location.
- DRM core 414 checks to see whether the license is stored within license store 415 and retrieves the license if found. Otherwise, the identified license server URL is contacted to request a license.
- license data generator 416 provides DRM core 414 with a machine identification which is unique to the end user's machine for comparison with the header information. Using all of the obtained information, DRM core 414 through DRM module 420 contacts license server 406 to request the session key and status data for the given machine.
- the session key is a single session key, meaning that it enables playback of the encrypted files only for a single session.
- DRM module 420 responds by directing DRM proxy 422 to contact and obtain a license (which contains the session key) from license server 406. Upon successful verification of the license terms, license server 406 delivers the license that contains the session key.
- DRM proxy 422 passes the license back to DRM module 420, which in turn forwards it to DRM core 414.
- DRM core 414 retrieves the session key and passes the key securely back to player module 410.
- player module 410 forwards the key and encrypted content files 404 to DRM decoder 412 which executes the decryption process and returns the decrypted files to player module 410.
- content player 410 passes the decrypted content files content player 408 for playback. It should be noted that the preceding steps are only performed for the first chunk of encrypted content after which subsequent chunks are automatically played back.
- the player module 410 when it hands encrypted content to the decoder module 412, because content is encrypted on a frame-by-frame basis. This makes seeking a specific location and the content a little more difficult and, as such, the decoder module may be provided with API (application programming interface) to aid the caller in dealing with these frames. In this manner, the present invention enables system 400 to upload encrypted content files 404 and play back those content files using a content player module 410.
- API application programming interface
- Fig. 5 is a block diagram of zipLock system 500 for acquiring a license which authorizes user playback of a content file.
- system 500 includes client and server sides 522 and 520.
- client side 522 includes DRM proxy 504 for preparing data for a license request, module 506 for building a license request message, DRM core 508 for obtaining machine specific information from license data generator 510, and license database 512 for storing license files.
- the user purchases content such as music recordings (for example) from the store front at a website (not shown).
- content such as music recordings (for example) from the store front at a website (not shown).
- Numerous websites are available for purchasing various types of digital content including Disney.com®, Sony.com®, and Shockwave.com®, for example.
- the user Using a web browser or a program that is capable of posting a web form to server 516, the user initiates the transaction with the appropriate website.
- the transaction typically involves several round trips to the web site with the transaction concluding with a request for a box file 502.
- Box file 502 is a file that describes the content requested by the user, and in one embodiment has a .cBox extension.
- DRM proxy 504 contains a box file handler and is registered with system 500 as the handler for files with the .cBox extension.
- DRM proxy 504 directs module 506 to build a license request message for forwarding to license server 516.
- this request is in XML (extensible markup language) format.
- Module 506 queries the machine identification to be included in the license request.
- DRM proxy 504 starts a network job which sends the license request message to license server 516.
- License server 516 in one embodiment is a CGI (common gateway interface) program available through license server 516.
- license server 516 verifies that the content file has been purchased prior to continuing with the processing of the license request.
- zipLock data base 514 contains the terms of the license along with the keys for decrypting the content file. These terms are retrieved and forwarded to license generator 518. It should be observed that a different license generator is implemented for each digital rights management solution being employed on client side 522. License generator 518 generates the license which includes the terms of the license. Also included within the license, are the keys for decrypting the content file.
- the content decryption keys are bound to the particular machine located on the client side 522.
- particular information that is unique to the machine such as the machine identification number is bound to the license.
- the present invention implements a machine-binding solution which allows digital content playback only on a particular machine.
- license server 516 Upon receiving the license from license generator 518, license server 516 forwards the license over the network to DRM proxy 504.
- DRM proxy forwards the license to module 506 for DRM-specif ⁇ c processing.
- DRM core 508 retrieves the license and stores the license within database 512.
- the process for retrieving a license may occur subsequent to a purchase transaction such as when the user wishes to play back content offline.
- license acquisition can also occur when there is no financial transaction involved; for example, when the user requests a trial license.
- a trial license permits a user to utilize the content files for a specific period after which the trial license expires. Table 1 below illustrates exemplary steps taken by system 500 to acquire a license when there is no financial transaction involved.
- a content player (not shown) asks DRM core 508 to play a content.
- DRM core 508 checks its local store, e.g., license store 512, and finds there is no valid license available (it finds no license or license is expired).
- local store e.g., license store 512
- DRM core 508 fields a license request message with the machine identification.
- DRM core 508 invokes DRM proxy 504 to send a license request message.
- DRM proxy starts a network job to send a license request message to license server 516.
- License server 516 presents a page to collect license terms desired by the user and supported by system 500 before continuing with the processing of license request.
- the terms of the license are collected and sent to data base 514.
- the license request along with the terms of the license and keys for decryption, are retrieved from data base 514 and are dispatched to license generator 518.
- the license is generated from the obtained information.
- the license data is returned to server 516.
- License data is returned over the network to the DRM proxy 504.
- DRM proxy 504 passes the license response message to DRM 506 for DRM-specific processing.
- DRM module 506 via DRM core 508 saves the license data in its license store 512 in its own specific way.
- the present invention advantageously separates a portion of the content from the original content file until decryption time to prevent unauthorized content usage. Moreover, licenses are bound to particular machines so that copying the content to a machine other than the authorized machine is futile.
- the present invention also utilizes a secure data channel in which the content keys are passed in secured format. Code obfuscation is used to hide code that handles decrypted data.
- the system of the present invention manages rights to one or more digital content files within a computer network and limits the playback of such content files to an authorized user. Furthermore, the present invention facilitates distribution and content production, which ultimately results in a shorter product development cycle.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Computer Security & Cryptography (AREA)
- Software Systems (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Databases & Information Systems (AREA)
- Technology Law (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001285265A AU2001285265A1 (en) | 2000-09-12 | 2001-08-24 | System for managing rights and permitting on-line playback of digital content |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US65990200A | 2000-09-12 | 2000-09-12 | |
US09/659,902 | 2000-09-12 |
Publications (3)
Publication Number | Publication Date |
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WO2002023315A2 WO2002023315A2 (fr) | 2002-03-21 |
WO2002023315A9 true WO2002023315A9 (fr) | 2002-12-19 |
WO2002023315A3 WO2002023315A3 (fr) | 2003-08-07 |
Family
ID=24647295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/026495 WO2002023315A2 (fr) | 2000-09-12 | 2001-08-24 | Systeme destine a la gestion des droits, permettant la lecture de contenu numerique en ligne |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2001285265A1 (fr) |
WO (1) | WO2002023315A2 (fr) |
Families Citing this family (28)
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US7353402B2 (en) | 2002-06-28 | 2008-04-01 | Microsoft Corporation | Obtaining a signed rights label (SRL) for digital content and obtaining a digital license corresponding to the content based on the SRL in a digital rights management system |
US7631318B2 (en) | 2002-06-28 | 2009-12-08 | Microsoft Corporation | Secure server plug-in architecture for digital rights management systems |
US7549060B2 (en) * | 2002-06-28 | 2009-06-16 | Microsoft Corporation | Using a rights template to obtain a signed rights label (SRL) for digital content in a digital rights management system |
US7502945B2 (en) | 2002-06-28 | 2009-03-10 | Microsoft Corporation | Using a flexible rights template to obtain a signed rights label (SRL) for digital content in a rights management system |
US20050227763A1 (en) * | 2004-03-31 | 2005-10-13 | Microsoft Corporation | Game controller power management |
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2001
- 2001-08-24 AU AU2001285265A patent/AU2001285265A1/en not_active Abandoned
- 2001-08-24 WO PCT/US2001/026495 patent/WO2002023315A2/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
AU2001285265A1 (en) | 2002-03-26 |
WO2002023315A2 (fr) | 2002-03-21 |
WO2002023315A3 (fr) | 2003-08-07 |
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