WO2004064318A1 - コンテンツ再生装置、ライセンス発行サーバ及びコンテンツ再生システム - Google Patents
コンテンツ再生装置、ライセンス発行サーバ及びコンテンツ再生システム Download PDFInfo
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- WO2004064318A1 WO2004064318A1 PCT/JP2004/000143 JP2004000143W WO2004064318A1 WO 2004064318 A1 WO2004064318 A1 WO 2004064318A1 JP 2004000143 W JP2004000143 W JP 2004000143W WO 2004064318 A1 WO2004064318 A1 WO 2004064318A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00137—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users
- G11B20/00144—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users involving a user identifier, e.g. a unique customer ID
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00478—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier wherein contents are decrypted and re-encrypted with a different key when being copied from/to a record carrier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
- G11B20/00492—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted
- G11B20/00521—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted wherein each session of a multisession recording medium is encrypted with a separate encryption key
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
- G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
- G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
- G11B20/00782—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of times a program can be installed
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
- G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
- G11B20/00797—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of times a content can be reproduced, e.g. using playback counters
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
- G11B20/0084—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific time or date
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00855—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a step of exchanging information with a remote server
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
Definitions
- the present invention relates to a content playback device, a license issuing server, and a content playback system that play back content protected by copyright according to usage conditions.
- r content digital content such as music, video, and games
- a system called a content distribution system that enables the use of content in terminal devices has entered the practical stage.
- copyright protection technology is used to protect the copyright of content and prevent unauthorized use of the content by malicious users.
- Copyright protection technology specifically, uses cryptographic technology to securely control the use of content, such as reproducing content or copying content to recording media. Technology.
- a patent document Japanese Patent Application Laid-Open No. 2000-293934 discloses that a server device generates a license including a partial use condition such as the number of times of reproduction of contents available in a terminal device.
- a partial use condition such as the number of times of reproduction of contents available in a terminal device.
- the terminal device A system that controls the use of content is described as an example of a content distribution system.
- a method for realizing content copyright protection using such copyright protection technology is referred to as a rights management method.
- the different rights management methods are, specifically, the physical data structure (data length, sequence, encryption method, etc.) of usage condition information and license information indicating the contents of the right to use content, and its interpretation. It means that the method (expression form, correspondence between bit pattern and semantic content, etc.) is different.
- a receiving unit that receives a license from a server and stores the received license in order to securely control the use of content based on a partial usage condition included in the license received from the server.
- the storage unit and the playback unit that generates playback data from the content based on the partial usage conditions included in the license are configured as one package.
- the rights management system S1 developed by the manufacturer M1 and the rights management system S2 developed by the manufacturer M2 are used for server equipment and terminal devices.
- the processing units that perform the same processing are provided redundantly in the same device. There is a problem that the burden increases.
- An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a content distribution system capable of controlling the use of contents in one system based on a plurality of rights management systems. It is a second object of the present invention to reduce the burden of mounting a server device and a terminal device in such a content distribution system. Disclosure of the invention
- a content reproducing apparatus reproduces content based on license information including usage conditions, which is information indicating a usable range of a digital work content.
- a content reproducing device that performs copyright protection for the content using copyright protection technology, and uses the license based on usage conditions included in each license information generated under a plurality of different rights management schemes.
- a plurality of use condition determining means provided for each of the right management methods, for determining whether or not use of the content corresponding to the information is possible; and the right management method of the license information corresponding to the content is specified.
- the use condition determination means corresponding to the right management method selected, and the selected use condition determination means determines whether the content can be used.
- a reproducing means for reproducing the content when the selected use condition determining means determines that the content can be used.
- the license issuance server of the present invention is a license issuance server that issues license information for controlling use of content in the content reproduction device, and is a content that is a digital work.
- Use condition storage means that stores in advance use conditions, which are information indicating the usable range of data, and multiple rights management methods for implementing copyright protection of content using copyright protection technology
- a plurality of license generation means provided for each of the right management methods, the license generation means generating license information including the use condition, based on the license information, and a license management method corresponding to a specific right management method requested by the content reproduction device.
- the content reproduction system of the present invention includes a server that generates and issues license information for controlling use of content in the content reproduction device, and a content that reproduces content based on the license information acquired from the server.
- a content playback system comprising a content playback device, wherein the server preliminarily stores usage conditions, which are information indicating a usable range of the content, which is a digital work.
- Generating license information including the use conditions based on a condition storage unit and a plurality of rights management methods for realizing copyright protection of the content using the copyright protection technology; Corresponding to a plurality of license generation means provided in the content reproducing apparatus and a specific right management method requested by the content reproducing apparatus.
- a plurality of use condition determining means provided for each of the right management systems, and a right management system of the license information corresponding to the content;
- the present invention can be realized not only as such a content playback system, but also as a single unit such as a license issuing server and a content playback terminal which constitute the content usage management system.
- a common cryptographic communication means can be shared by a plurality of rights management systems, thereby reducing the burden of implementation in a terminal device.
- the same device or program can be shared by a plurality of rights management systems by commonly using the license storage unit and the reproduction unit in a plurality of systems.
- FIG. 1 is a diagram showing an overall configuration of a content reproduction system according to the present embodiment.
- FIG. 2 is a block diagram showing an internal configuration of the content reproduction terminal shown in FIG.
- FIG. 3 is a block diagram showing the internal configuration of the license issuing server shown in FIG.
- FIG. 4 is a diagram showing a data structure of content key information in the present embodiment.
- FIG. 5 is a diagram showing a data structure of use condition information in the present embodiment.
- FIGS. 6A and 6B are diagrams showing the data structures of licenses of the right management system S1 and the right management system S2 in the embodiment of the present invention.
- FIG. 7 is a flowchart showing processing in the content reproduction terminal when a license is issued from the license issuance server shown in FIG. 1 to the content reproduction terminal.
- FIGS. 8A and 8B are diagrams showing a data structure of a license issuance request message in the right management method S1 and the right management method S2 in the present embodiment.
- FIG. 9 is a flowchart showing a process at the time of license generation in the license issuing server shown in FIG.
- FIG. 10 is a flowchart showing processing at the time of content reproduction in the content reproduction terminal shown in FIG.
- Figure 11 shows a license transfer between the content playback terminals shown in Figure 1.
- 6 is a flowchart showing a process in the first content reproduction terminal when the content is operated.
- FIG. 12 is a diagram showing a data structure of a license transfer request message according to the present embodiment.
- FIG. 13 is a flowchart showing a process at the time of moving a license in the second content reproduction terminal shown in FIG.
- FIG. 14 is a diagram illustrating another configuration example of the first content reproduction terminal and the second content reproduction terminal of the present embodiment.
- FIG. 1 is a block diagram showing an overall configuration of a content reproduction system according to the present embodiment.
- one license issuing server generates and issues a license according to a different right management method specified by the content playback terminal, and the content playback terminal uses a different format for each right management method.
- This is a system for reproducing content in accordance with a license of a content, and includes a first content reproduction terminal 101, a second content reproduction terminal 102, and a license issuing server 103.
- the first content playback terminal 101 and the second content playback terminal 102 are connected via the home network 104, and the first content playback terminal 101 and the second content playback terminal 101 are connected to each other via the home network 104.
- the reproduction terminal 102 and the license issuing server 103 are connected via the Internet 105.
- the first content playback terminal 101 and the second The content playback terminal 102 requests the license issuing server 103 to issue a license to use the content when using the content, and reproduces the content in accordance with the license issued in response to the request. It is a place.
- the license issuing server 103 generates and issues licenses based on different rights management methods in response to license issuance requests from the first content playback terminal 101 and the second content playback terminal 102. Server.
- a server for distributing the content itself In a general content distribution system, a server for distributing the content itself, a server for accepting the purchase of the content, and a server for managing the users are also required, but they are not related to the purpose of the present invention. Illustration and explanation are omitted.
- FIG. 2 is a block diagram showing a configuration of the first content reproduction terminal 101 shown in FIG.
- a first content playback terminal 101 is a content playback terminal that plays back content in accordance with a license of a format different for each right management method, and an input reception unit 201, An encryption communication unit 202, a license storage unit 203, a plurality of use condition determinations ⁇ An update unit 204, a method selection unit 205, a reproduction unit 206, and a content decryption unit 207 are provided.
- the input receiving unit 201 includes a display unit such as a monitor (not shown) and an input operation unit such as a keyboard, and allows a user to input a selection of content to be used and a password for user authentication. Accept.
- the cryptographic communication unit 202 communicates with the license issuing server 103 via a secure communication channel such as SSL (Secur e Socket Layer), which is one of SAC (Secur e Authentic i cat on channel) communication methods. And securely receive the issued licenses. License rating
- the storage unit 203 stores the license issued from the license issuing server 103 securely. Usage condition determination ⁇
- the update unit 204 determines whether or not the content can be used in accordance with the usage conditions described in the license.
- the method selection unit 205 searches the license storage unit 203 for a license corresponding to the content or a license designated by the user, identifies the rights management method of the license, and identifies the identified rights management method. Identify the use condition judgment and update unit 204 corresponding to. Further, the method selection unit 205 reads the usage conditions described in the license and determines the corresponding usage conditions. ⁇ Notifies the updating unit 204 to determine whether or not the content can be used, or describes the content in the license. It has a function of passing the encrypted content key to the content decryption unit 207 to decrypt the encrypted content.
- the method selection unit 205 passes the content decoded by the content decoding unit 207 to the playback unit 206, and causes the playback unit 206 to play back the content.
- the reproduction unit 206 reproduces the decrypted content.
- the content decryption unit 2007 decrypts the encrypted content with the content key passed from the system selection unit 205.
- the tamper-resistant part 208 and the tamper-resistant part 209 surrounded by a dotted line in the drawing indicate components mounted on the first content reproduction terminal 101 in the tamper-resistant.
- the tamper-resistant section 208 includes an encryption communication section 202, a license storage section 203, a use condition determination section, an update section 204, a method selection section 205, and a content decryption section 207. You.
- the tamper-resistant section 209 includes a reproducing section 206.
- tamper resistance is a physical or logical technique that makes it difficult to steal or falsify secret information by unauthorized procedures from the outside, or to make unauthorized operations impossible. .
- Tamper resistance is within a certain range of modules Can be applied collectively.
- the encryption key of the content used in reproducing the content and the usage conditions are illegally intercepted or tampered with. Can be prevented.
- the encryption communication unit 202, the license storage unit 203, the usage condition determination unit 204, the method selection unit 205, the content selection unit 205 shown in the range of the tamper-resistant unit 208 It is assumed that the decoding unit 207 is executed on the same CPU, and the LSI constituting this CPU is configured to be tamper-resistant in hardware.
- the encryption communication unit 202, the license storage unit 203, the use condition determination ⁇ the update unit 204, the method selection unit 205, and the content decryption unit 207 are collectively tamper-resistant.
- the playback unit 206 since the LSI for playing back the content exists separately from the CPU, the tamper-resistant range is also different.
- bus encryption is used for communication between the method selection unit 205 and the reproduction unit 206.
- an encryption key is determined in advance between the method selecting unit 205 and the reproducing unit 206.
- the decrypted content is re-encrypted using the encryption key or the session key exchanged using the encryption key, and transmitted. This makes it possible to securely perform communication between the tamper-resistant two.
- FIG. 3 is a block diagram illustrating a configuration.
- the license issuance server 103 is a server that generates and issues a license according to a different right management method in response to a request from the content playback terminal, and includes a content key storage unit 301 and a plurality of license generation units 3002. , A use condition storage unit 303, a method selection unit 304, and an encryption communication unit 305.
- the content key storage unit 301 stores content key information in which a content ID is associated with a content key.
- the license generation unit 302 is provided for each rights management system, and each license generation unit 302 generates a license in a format uniquely determined for each rights management system.
- the use condition storage unit 303 stores use condition information indicating a usable range of specific content for each user.
- the method selection unit 304 specifies the license generation unit 302 that generates a license in the right management method specified by the license issuance request from the content playback terminal, and specifies the specified license generation unit 302. Instructs the license generation.
- the cryptographic communication unit 3005 Upon receiving the license issuance request from the content playback terminal and succeeding in generating the license, the cryptographic communication unit 3005 establishes a secure communication path, such as SSL, with the content playback terminal, and is established. Send the license over a secure channel. If the license generation fails, a message indicating that the license issuance has failed is sent to the content playback terminal.
- a secure communication path such as SSL
- FIG. 4 is a diagram showing an example of a data structure of content key information stored in the content key storage unit 301 shown in FIG. The following two pieces of information are recorded as content key information.
- the content key information stored in the column of the second row of the content key information in FIG. 4 is such that the content indicated by the content ID CIDCID—00001 ”is the content key“ ⁇ ! 4.D j Indicates that it was encrypted using this method.
- FIG. 5 is a diagram showing an example of a data structure of usage condition information stored in the usage condition storage unit 303 shown in FIG. The following seven types of information are recorded as usage condition information.
- the usage condition information stored in the column of the second row in FIG. 5 is such that the user ⁇ US—00001 ”uses the rights management method ⁇ DRM—S1” and the content ID “CID—0000”. It indicates that the user has the right to use the content specified in “1” three times by “January 31”.
- FIG. 6 is a diagram showing an example of a data structure of a license issued to the content reproduction terminal shown in FIG. 1 and stored in the license storage unit 203 shown in FIG.
- the data structure of the license is different for each rights management method, except that “Rights management method IDJ is described at the beginning of the license, which stores information for specifying the rights management method.
- FIG. 6 (a) shows the data structure of the license of the rights management method S1 represented by the rights management method ID ⁇ DRM—S1. The following five pieces of information are stored in the license.
- the content specified by the content ID "CID-001J” is encrypted with the content key ⁇ Y! 4.DJ. 3 1 day ” ⁇ once j is available.
- FIG. 6 (b) shows the data structure of the license of the rights management method S2 represented by the rights management method ID DDRM—S2J.
- the license stores the following five types of information.
- the content specified by the content ID "CID-002J” is encrypted with the content key "QWERTYJ, ⁇ 30 minutes ”Indicates that it can be used.
- FIG. 7 is a processing flowchart of the first content playback terminal 101 when a license is issued from the license issuing server 103 shown in FIG. 1 to the first content playback terminal 101. is there.
- the first content reproduction terminal 101 displays, in the input reception unit 201, a list of contents in which the content name, the name of the performer of the content, and the name of the distributor of the content are listed.
- the user obtains the content ID of the desired content by selecting the content name from the user.
- the input receiving unit 201 also displays, for example, the type of the rights management method or the name of the company that manages the copyright in the contents list, and allows the user to select the desired rights from the list.
- the rights management method ID is not limited to the type of the rights management method or the name of the company that manages the copyright, but may be another specific type in the contents list displayed on the input reception unit 201.
- An item, for example, a content distribution source name may be associated with the content distribution source name, and when the user selects the content distribution source name, a rights management method ID corresponding to the selected distribution source may be acquired.
- the first content reproduction terminal 101 receives the input for instructing the reproduction of the content from the user in the input reception unit 201, and issues the license to the license issuance server 103.
- the request is made using the encryption communication unit 202.
- the encryption communication unit 202 requests the license issuing server 103 to establish a session of TCP PZI (S701).
- the cryptographic communication unit 202 requests the license issuing server 103 to establish an SSL session.
- SSL first authenticates between communication endpoints to prevent impersonation by a third party. It also shares the encryption key used for message encryption within the communication session. In subsequent communications, the message is encrypted using this encryption key to prevent eavesdropping by third parties.
- the message is signed using a one-way function such as SHA-1 to prevent tampering by a third party. Also, a sequence number is assigned to the message, thereby preventing a message replay attack (S702 to S703).
- FIG. 2 is a diagram showing an example of a data structure of a license issuance request message in FIG. The following three pieces of information are stored in the license issuance request message in the rights management method S1.
- FIG. 8 (b) is a diagram showing an example of a data structure of a license issuance request message in the rights management method S2 shown in FIG.
- two pieces of information are stored in the license issuance request message in the right management method S2. Therefore, the number of uses or the use time corresponding to the “expected number of uses” in which content can be used with this license is a predetermined value.
- the license issuance request message storing these two pieces of information is: It is transmitted to the license issuing server 103 (S704 to S705). If the license is successfully received in response to the transmitted license issuance request message, the encryption communication unit 202 stores the received license in the license storage unit 203 (S706 to S770) 7).
- the encryption communication unit 202 disconnects the session (S708 to S709). If there is a license for which issuance has not been requested yet, a license issuance request message is created and transmitted to the license issuance server 103 (S705 to S707).
- FIG. 9 is a flowchart showing a license generation process in license issuing server 103 when receiving a license issuance request from first content reproduction terminal 101 shown in FIG.
- the license issuing server 103 acquires the user ID of the user who made the request in advance based on the authentication information at the time of establishing the SSL session. Now, when the cryptographic communication unit 305 receives the license issuance request, it first obtains the right management method ID existing at the top of the message (S910).
- the cryptographic communication unit 304 determines that the license issuance request message is in the rights management method S 1 and the content of the following message The content ID and the expected number of times of use are obtained (S902 to S903).
- the cryptographic communication unit 3005 determines that the license issuance request message is in the rights management method S2, and transmits the following message.
- the content ID that is the content is acquired (S906 to S907).
- the method selection unit 304 continues to be specified.
- a use condition that matches the condition is searched from the use conditions stored in the use condition storage unit 303.
- the method selection unit 304 notifies the encryption communication unit 305 that the license generation has failed.
- the encryption communication unit 305 returns a message indicating that the license issuance has failed to the first content reproduction terminal 101 (S904 to End).
- the method selection unit 304 instructs the license generation unit 302 specified by the “rights management method ID” to generate a license.
- the instructed license generation unit 302 performs a unique process for each right management method, and generates a license to be issued to the first content reproduction terminal 101.
- the expected usage count is ⁇ 1 time as shown in Figure 8 (a).
- the license generation unit 302 corresponding to the rights management method S1 will use the license as shown in Fig. 6 (a) for the number of usages of "1 time” and the expiration date of 1 month. 3 Generate a license with "1 day” set.
- the use condition stored in the use condition storage section 303 is updated in accordance with the content of the issued license (S905).
- FIG. 10 is a flowchart showing processing when content is reproduced in the first content reproduction terminal 101 shown in FIG.
- the user of the first content reproduction terminal 101 selects the content in the input receiving unit 201 and instructs the reproduction.
- the reproduction instruction is notified from the input receiving unit 201 to the reproducing unit 206.
- the playback unit 206 acquires the content ID of the specified content from the input reception unit 201, and the playback unit 206 issues a playback instruction to the format selection unit 205 together with the content ID.
- Notify S1001
- the method selection unit 205 searches for a license stored in the license storage unit 203, and searches for a license that matches the specified content ID (S1002).
- the method selection unit 205 acquires the “rights management method ID” that is described at the top of all the rights management methods of the searched license. I do.
- use condition determination corresponding to “Rights management method ID” is performed.
- the use conditions included in the license are also notified.
- the use condition determination / update unit 204 determines whether the content can be used based on the use condition included in the license. For example, if the license includes “number of uses”, the license is determined to be usable if the remaining number of uses is ⁇ 1 or more. If the license includes the "expiration date”, it is determined that the license is usable if the current time is before the "expiration date” (S1003).
- the method selecting unit 205 instructs the content decoding unit 207 to decode the content.
- the content key included in the license is used for decrypting the content.
- the content thus decrypted is transmitted to the reproducing unit 206 via the method selecting unit 205, and the reproducing unit 206 reproduces the content according to the instruction of the method selecting unit 205. (S1004).
- a message regarding the usage conditions of the content is sent from the playback unit 206 to the method selection unit. Sent to 205.
- the method selection unit 205 that has received the message about the consumed usage condition specifies the usage condition determination / update unit 204 corresponding to the usage condition, and determines the specified usage condition determination 'update unit 2 Inform 04 of the use time or the number of uses received from the playback unit 206 and instruct it to update the use conditions.
- the usage condition judgment received from the method selection unit 205 and the update unit In 204 the consumed content such as the usage time or the number of uses notified from the method selection unit 205 is subtracted from the usage conditions before the reproduction of the corresponding content is started, and the usage of the reproduced content is performed.
- the condition is updated (S1005).
- the update unit 204 notifies the method selection unit 205 of the update result of the use condition instructed to be updated.
- the method selection unit 205 searches the license storage unit 203 for the license from which the usage conditions before the update have been read, and determines the usage conditions of the license by using the usage condition determination / update.
- the update result notified from the part 204 is rewritten (S106). As a result, for example, a license that was "use three times" before the content playback started was changed to "use twice" because the playback unit 206 used the license only once. Will be updated.
- FIG. 11 shows a process performed by the first content playback terminal 101 when a license is transferred from the second content playback terminal 102 shown in FIG. 1 to the first content playback terminal 101. It is a flowchart shown below.
- the first content reproduction terminal 101 receives an instruction from the terminal user via the input reception unit 201, and sends a license to the second content reproduction terminal 102 using the encryption communication unit 202. Request a move.
- the encryption communication unit 202 first requests the second content reproduction terminal 102 to establish a TCPZIP session (S 110). 1) o
- the cryptographic communication unit 202 requests the second content reproduction terminal 102 to establish an SSL session (S 1102 to S 11 0 3).
- the cryptographic communication unit 202 If the SSL session is established, then the cryptographic communication unit 202
- FIG. 12 shows the data structure of the license transfer request message. The following two pieces of information are stored in the message.
- the encryption communication unit 202 stores the received license in the license storage unit 203 (S1106-S1107).
- the encryption communication unit 202 disconnects the session (S1108 to S1109).
- FIG. 13 shows the second content reproduction terminal 10 when the license transfer request is received from the first content reproduction terminal 101 shown in FIG.
- the encryption communication unit 202 of the second content reproduction terminal 102 receives the license transfer request from the first content reproduction terminal 101, First, the right management method ID existing at the top of the message is acquired (S1301).
- the cryptographic communication unit 202 acquires the content ID from the license transfer request message (S 13 0 2 to S 13 03, S 13 06).
- the license that meets the specified conditions is stored in the license storage unit 203 Search from among the licensed licenses.
- a search is performed for a content whose content ID included in the license transfer request message matches the license's “Content I DJ. If there is a match, there was a moveable license (S1304).
- the cryptographic communication unit 202 sends a message to the first content playback terminal 101 indicating that the license transfer has failed. Return and end the processing (S1304 to End).
- the license management system inquires of the use condition determination 'update unit 204 corresponding to the right management method ID whether or not movement is possible. Here, it is determined that movement is always possible in the right management method S1 and that movement is always impossible in the right management method S2. As a result of such judgment, If it is determined that the transfer is possible, the license is transmitted to the first content playback terminal 101, and the license is deleted from the license storage unit 203 (S1305, S13007) ).
- the cryptographic communication unit 202 sends a message indicating that the license transfer has failed to the first content playback terminal 101. Return and end the processing (S1304 to End).
- a license based on a plurality of different rights management methods can be generated without contradiction in one license issuing server 103. Further, even when one license issuance server 103 issues licenses based on a plurality of different rights management schemes, each of the first content reproduction terminal 101 and the second content reproduction terminal 101 In 102, the content can be used without any trouble according to the license based on the right management method desired by the user.
- a processing unit that can perform processing according to a common method between different right management methods, for example, an encryption communication unit 202, a license storage unit 203, a reproduction unit 206, and a content decryption unit By sharing 207, etc., the mounting load of the content playback terminal can be effectively reduced.
- the license on the communication path is leaked. Content, and effectively protect the copyright of the content.
- the encryption communication unit 202, license storage unit 203, usage condition determination inside the content playback terminal ⁇ update unit 204, method selection unit 205, playback unit 206, and content decryption unit 20 7 for Tanproof Since it is composed of a personal module, the license processed inside the content reproduction terminal and the decrypted content can be kept secure.
- the license issuance server 103, the first content playback terminal 101, and the second content playback terminal 102 are assumed to be connected via the Internet.
- the present invention is not limited to this. It may be a telephone line, a dedicated line, or a broadcast.
- license storage unit 203 there is only one license storage unit 203 in the first content reproduction terminal 101, but it is also possible to have one license storage unit 203 for each rights management system. Good. Also, the license storage unit 203 may be shared in common for each specific right management method.
- the playback unit 206 and the system selection unit 205 are configured to be directly connected.
- the present invention is not limited to this.
- a separate control unit is provided, and the system selection unit is provided via this control unit.
- a configuration in which a playback instruction is notified to 205 may be used.
- the connection relationship between the other units may be connected by a route other than that shown in the present embodiment.
- the cryptographic communication unit 202, the license storage unit 203, the use condition determination / update unit 204, the method selection unit 205, and the content decryption unit 207 are executed by the same CPU. For this reason, it is assumed that tamper resistance is performed collectively as hardware. However, it is also possible to adopt a configuration in which tamper resistance is provided individually or in several groups by grouping different from the present embodiment.
- the use condition judging unit ⁇ The updating unit 204 may be added later, so that the added use condition judging unit may be tamper-resistant in another range.
- tamper-resistance is used in another range, SAC or bus encryption must be used for communication between parts that do not belong to the same tamper-resistance range. Also, here, only the reproduction unit 206 is tamper-resistant in another range, but tamper-resistance may be performed in the same range as the encryption communication unit and the like.
- the content decoding unit 2007 is assumed to be tamper-resistant in the same range as that of the system selection unit 205, but may be tamper-resistant in the same range as that of the reproduction unit 206.
- the content decryption unit 2007 is called from the playback unit 206, and the system selection unit 205 notifies the playback unit 206 of the content decryption key instead of the decrypted content.
- bus cipher is used for communication between the method selecting unit 205 and the reproducing unit 206, but SAC communication may be used.
- SAC communication may be used.
- implementation burden can be reduced by using common SAC communication in each system instead of using different SAC communication for each rights management system.
- the encryption communication unit 202 and the like are executed by the CPU mounted in the terminal device, but may be mounted by using an IC card that can be mounted on the terminal device. This eliminates the need for the terminal maker to mount the parts related to security on the terminal, and allows the terminal to be easily mounted. In addition, by mounting only the additional use condition determination unit using an IC card, it is possible to safely add the use condition determination unit.
- the rights management method ID for specifying the license generation unit 302 used for issuing a license on the server side is stored in advance in the usage condition information.
- the present invention is not limited to this.
- a configuration may be adopted in which a license management method ID of a license to be issued at the time of a license issuance request from a content reproduction terminal is notified.
- the rights management method ID that the terminal supports By notifying the user it is possible to issue a usable license without fail.
- the license issuance server 103 has only one content key storage unit 301 and one usage condition storage unit 303 here, one content key is stored for each rights management system. It may have a section 301 and a use condition storage section 303. Further, a common content key storage unit 301 and a use condition storage unit 303 may be shared for each specific right management method.
- the data structure of the license is different for each rights management method except for the “rights management method ID”, but “there may be common parts other than the rights management method IDJ.
- the method of storing the content key may be defined in common.
- the timer for measuring the current time for judging the expiration date is provided for each usage condition judging unit.However, it is not possible to separately implement the function for managing the current time securely. Because the burden is high, the current time management function may be shared by the use condition determination units.
- the license transfer request message is the same for each rights management method, but the data structure may be different messages.
- a license can be moved is uniquely determined for each rights management method as being movable or non-movable.
- whether or not the license can be moved may be described in a use condition included in the license.
- FIG. 2 shows the internal configuration of the first content reproduction terminal 101 and the second content reproduction terminal 102.
- the first content reproduction terminal 101 and the second content reproduction terminal 102 have the same structure.
- the configuration of the second content reproduction terminal 102 is not necessarily limited to this.
- a configuration may be employed in which the content decoding unit 2007 is provided inside the tamper-resistant unit 208 and between the system selection unit 205 and the reproduction unit 206.
- FIG. 14 is a diagram showing another configuration example of the first content reproduction terminal 101 and the second content reproduction terminal 102 of the present embodiment.
- the method selection unit 205 reads out the content key from the license, passes it to the content decoding unit 207, and updates the usage condition judgment and update. If the content can be used by the unit 204 and if it can be used, if necessary, playback control data indicating the usage time and the number of times of use is transmitted to the content decoding unit 207.
- the content decrypting unit 2007 decrypts the encrypted content using the content key acquired from the format selecting unit 205, transmits the decrypted content to the reproducing unit 206, and transmits the decrypted content to the format selecting unit 205.
- the playback control data of the content obtained from 205 is transmitted to the playback unit 206 to instruct playback of the decrypted content.
- the content decryption unit 2007 It has been described that the playback control data of the content based on the usage conditions is also transmitted to the playback unit 206 to instruct the playback of the content.
- the present invention is not limited to this, and the decrypted content and the playback control data are not limited to this. May be transmitted to the reproduction unit 206 via another path. In this case, the number of signal lines between the tamper-resistant section 208 and the tamper-resistant section 209 is increased, which is not preferable.
- the decrypted content is transmitted from the content decrypting section 207 to the reproducing section.
- the reproduction control data of the content and the instruction to reproduce the content are transmitted from the method selection unit 205 to the reproduction unit 206.
- the encrypted content is described as being encrypted by the common encryption method.
- the present invention is not limited to this, and different encryption is performed for each rights management method. It may be encrypted by a method.
- the method selection unit 205 notifies the content decryption unit 205 of the content key and the rights management method ID.
- the content decryption unit 2007 includes a plurality of encrypted content decryption programs for decrypting the encrypted content according to the encryption scheme used in the notified right management scheme. Further, in this case, a plurality of content decryption units 207 corresponding to each right management method may be provided.
- the method selection unit 205 selects one of the plurality of use condition determination / update units 204 corresponding to the right management method. In the same manner as the selected method, the method selection unit 205 selects the content decoding unit 2007 corresponding to the target rights management method, and the selected content decoding unit 205 The content key may be notified to decrypt the encrypted content.
- the content reproduction terminal of the present invention is useful as a content reproduction device having a communication function, a personal computer, a PDA (Personal Digital Assistant), a mobile phone, an STB (Set Top Box), and the like.
- the content reproduction system of the present invention distributes a license of digital content such as video and music from a license issuing server to a content playback terminal via a communication network such as a broadcast network or the Internet, and distributes the license.
- a content usage system, etc. in which the content playback terminal uses digital content based on the license, especially in an environment where multiple rights management methods are mixed, while protecting the copyright of digital content while playing back content It is useful as a digital work utilization system that allows terminals to use various digital contents.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002499356A CA2499356A1 (en) | 2003-01-14 | 2004-01-13 | Content reproduction device, license issuing server, and content reproduction system |
EP04701684A EP1585249A1 (en) | 2003-01-14 | 2004-01-13 | Content reproduction device, license issuing server, and content reproduction system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-005193 | 2003-01-14 | ||
JP2003005193 | 2003-01-14 |
Publications (1)
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WO2004064318A1 true WO2004064318A1 (ja) | 2004-07-29 |
Family
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Family Applications (1)
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PCT/JP2004/000143 WO2004064318A1 (ja) | 2003-01-14 | 2004-01-13 | コンテンツ再生装置、ライセンス発行サーバ及びコンテンツ再生システム |
Country Status (6)
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US (1) | US20040186853A1 (ja) |
EP (1) | EP1585249A1 (ja) |
KR (1) | KR20050100596A (ja) |
CN (1) | CN1706149A (ja) |
CA (1) | CA2499356A1 (ja) |
WO (1) | WO2004064318A1 (ja) |
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CN101297518B (zh) * | 2005-10-28 | 2011-07-06 | 瑞尔视科技亚太有限公司 | 在支持不同drm方法的用户终端机间提供内容操作的drm网关方法和执行其方法的drm网关 |
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WO2005073869A2 (en) * | 2004-01-29 | 2005-08-11 | Matsushita Electric Industrial Co., Ltd. | Transmission apparatus, content reproduction apparatus and license distribution system |
KR20070030312A (ko) * | 2004-07-20 | 2007-03-15 | 마츠시타 덴끼 산교 가부시키가이샤 | 콘텐츠 관리시스템 및 콘텐츠 관리장치 |
WO2006032942A1 (en) * | 2004-09-23 | 2006-03-30 | Nokia Corporation | Method and device for protecting digital content in mobile applications |
WO2006047657A2 (en) * | 2004-10-25 | 2006-05-04 | Nalpeiron | System and method of authenticating licensed computer programs |
US8181266B2 (en) * | 2005-01-13 | 2012-05-15 | Samsung Electronics Co., Ltd. | Method for moving a rights object between devices and a method and device for using a content object based on the moving method and device |
US7827113B2 (en) * | 2005-03-30 | 2010-11-02 | Sony Corporation | Method and system for providing a content subscription service |
JP4760101B2 (ja) * | 2005-04-07 | 2011-08-31 | ソニー株式会社 | コンテンツ提供システム,コンテンツ再生装置,プログラム,およびコンテンツ再生方法 |
US7891011B1 (en) * | 2005-05-11 | 2011-02-15 | Sprint Spectrum L.P. | User-based digital rights management |
JP4613094B2 (ja) * | 2005-05-13 | 2011-01-12 | パナソニック株式会社 | 通信端末及び通信方法 |
JP4742682B2 (ja) * | 2005-06-01 | 2011-08-10 | 富士ゼロックス株式会社 | コンテンツ保護装置及びコンテンツ保護解除装置 |
CN101243686A (zh) * | 2005-08-08 | 2008-08-13 | 松下电器产业株式会社 | 加密内容及提供解密密钥的系统 |
KR101134043B1 (ko) * | 2006-04-25 | 2012-04-13 | 엘지전자 주식회사 | 저작권 관리기능을 갖는 이동통신단말기 및 그 저작권관리방법 |
EP2026238A4 (en) * | 2006-05-18 | 2012-05-30 | Panasonic Corp | ELECTRONIC DEVICE, CONTENT REPRODUCTION CONTROL METHOD, PROGRAM, STORAGE MEDIUM, AND INTEGRATED CIRCUIT |
KR101301360B1 (ko) | 2006-07-25 | 2013-09-16 | 소니 주식회사 | 컨텐츠 가입 서비스를 제공하기 위한 방법 및 시스템 |
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US8245310B2 (en) * | 2007-06-25 | 2012-08-14 | Microsoft Corporation | Controlling access to multiple pieces of content of a presentation |
KR20090033747A (ko) * | 2007-10-01 | 2009-04-06 | 에스케이 텔레콤주식회사 | 보안 기능을 구비한 메모리 카드에서 시간 관련 사용 권리관리 방법 |
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WO2012032754A1 (ja) * | 2010-09-08 | 2012-03-15 | パナソニック株式会社 | コンテンツ送信装置及びネットワークノード |
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- 2004-01-13 CA CA002499356A patent/CA2499356A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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CA2499356A1 (en) | 2004-07-29 |
EP1585249A1 (en) | 2005-10-12 |
CN1706149A (zh) | 2005-12-07 |
US20040186853A1 (en) | 2004-09-23 |
KR20050100596A (ko) | 2005-10-19 |
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