Information sending system, information sending device, information receiving device, information distribution system, information receiving system, information sending method, information receiving method, information distribution method, apparatus, sending method of information receiving device, playback method of apparatus, method of using contents and program storing medium

• US 20060168451A1
• Filed: 03/22/2006
• Published: 07/27/2006
• Est. Priority Date: 08/27/1999
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Tomoyuki, Oishi, Tateo, Ishibashi, Yoshihito, Matsuyama, Shinako, Muto, Akihiro, Kitahara, Jun
• Granted Patent: US 8,005,226 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 2221/2107 File encryption
• CPC Class Codes: G06Q 30/06 Buying, selling or leasing transactions
• CPC Class Codes: G10K 15/02 Synthesis of acoustic waves synthesis of speech G10L13/00
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 63/045 wherein the sending and receiving network entities apply hybrid encryption, i.e. combination of symmetric and asymmetric encryption cryptographic mechanisms or cryptographic arrangements using a plurality of keys or algorithms H04L9/14
• CPC Class Codes: H04L 63/102 Entity profiles
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 9/0891 Revocation or update of secret information, e.g. encryption key update or rekeying
• CPC Class Codes: H04L 9/0894 Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
• CPC Class Codes: H04L 9/3247 involving digital signatures
• CPC Class Codes: H04L 9/3263 involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements network architectures or network communication protocols for supporting authentication of entities using certificates in a packet data network H04L63/0823

Abstract

Content data encrypted with a content key, the content key encrypted with an individual key specific to an information sending device, and the individual key encrypted with a distribution key that is updated in a predetermined cycle, and supplied are sent to an information receiving device, and the information receiving device decrypts the individual key with the distribution key, decrypts the content key with the individual key, and decrypts the content data with the content key. Thus, the information sending device does not have the distribution key, and accordingly piracy of content data can be prevented with a simple configuration. Also, the information receiving device sends the content key and a playback command to other apparatuses. Thus, other apparatuses can play back contents using the playback command and the content key. Furthermore, the information sending device decrypts the content key with the distribution key before being updated, and stores the same. Thus, contents purchased by an advance order can be actually purchased regardless of expiration dates of the distribution key. Furthermore, usage right is passed from a first information receiving device to a second information receiving device different in registration information at the tome of using contents. Thus, contents can be used among information receiving devices different from each other in registration information.

Claims

1-68. -68. (canceled)

69. An information distribution system for distributing data from an information sending device to an information receiving device,

wherein said information sending device comprises:

first storing means for storing content data that is prohibited from being played by an information receiving device that does not include a content key;

second storing means for storing content data that is permitted to be played by an information receiving device that does not include the content key;

sending means for sending a plurality of distribution keys, each corresponding to a predetermined time period, and send data, which includes data encrypted with key data; and

said information receiving device comprises;

receiving means for receiving said send data and said plurality of distribution keys; and

receiving end controlling means for decrypting said encrypted data,

wherein each of said plurality of distribution keys allows decryption of said encrypted data within the predetermined time period associated with said distribution key, independent of a connection during said predetermined time period associated with said distribution key.

70. An information distribution method for distributing predetermined data from an information sending device to an information receiving device,

said method comprising:

a first storing step for storing content data, in a first storage location, that is prohibited from being played by an information receiving device that does not include a content key;

a second storing step for storing content data, in a second storage location, that is permitted to be played by an information receiving device that does not include the content key;

a sending step for sending a plurality of distribution keys, each corresponding to a predetermined time period, and send data which includes data encrypted with key data;

a decrypting step for receiving said send data and said plurality of distribution keys;

decrypting said encrypted data; and

permitting decryption of said encrypted data within the predetermined time period associated with said distribution key, independent of a connection during said predetermined time period associated with said distribution key.

71. An information sending device for sending predetermined data to an information receiving device, said sending device comprising:

first storing means for storing content data that is prohibited from being played by an information receiving device that does not include a content key;

second storing means for storing content data that is permitted to be played by an information receiving device that does not include the content key;

sending end controlling means for generating a plurality of distribution keys, each corresponding to a predetermined time period, and send data which includes data encrypted using key data; and

sending means for sending said send data and said plurality of distribution keys,

wherein each of said plurality of distribution keys allows decryption of said encrypted data within the predetermined time period associated with said distribution key, independent of a connection during said predetermined time period associated with said distribution key.

72. The information sending device according to claim 71, wherein said sending end controlling means generates send data including an individual key specific to said information sending device, as said data encrypted with said key data.

73. The information sending device according to claim 72, wherein said sending end controlling means generates send data including said data encrypted using said key data that is periodically updated.

74. The information sending device according to claim 73, wherein said sending end controlling means generates said send data including said encrypted data using said key data appropriate to an update period, in said data encrypted using said key data for a plurality of update periods given in advance together.

75-78. -78. (canceled)

79. An information sending method for sending predetermined data to an information receiving device, said method comprising:

a first storing step for storing content data that is prohibited from being played by an information receiving device that does not include a content key;

a second storing step for storing content data that is permitted to be played by an information receiving device that does not include the content key;

a generating step of generating a plurality of distribution keys, each corresponding to a predetermined time period, and send data which includes data encrypted using key data; and

a sending step of sending said send data and said plurality of distribution keys,

wherein each of said plurality of distribution keys allows decryption of said encrypted data within the predetermined time period associated with said distribution key, independent of a connection during said predetermined time period associated with said distribution key.

80. The information sending method according to claim 79, wherein in said generating step, send data including an individual key specific to said information sending device is generated as said data encrypted with said key data.

81. The information sending method according to claim 80, wherein in said generating step, send data including said data encrypted using said key data that is updated periodically is generated.

82. The information sending method according to claim 81, wherein in said generating step, said send data including said data encrypted using said key data appropriate to an update period, in said data encrypted using said key data for a plurality of update periods given together in advance, is generated.

83-86. -86. (canceled)

87. A program storing medium for storing an information sending method wherein said method comprises:

a first storing step for storing content data that is prohibited from being played by an information receiving device that does not include a content key;

a second storing step for storing content data that is permitted to be played by an information receiving device that does not include the content key;

a generating step of generating a plurality of distribution keys, each corresponding to a predetermined time period, and send data which includes data encrypted using key data;

a sending step of sending said send data and said plurality of distribution keys to said information receiving device; and

allowing decryption of said encrypted data within the predetermined time period associated with said distribution key, independent of a connection during said predetermined time period associated with said distribution key.

88. The program storing medium according to claim 87, wherein in said generating step, send data including an individual key specific to said information sending device is generated as said data encrypted with said key data.

89. The program storing medium according to claim 88, wherein in said generating step, send data including said data encrypted using said key data that is updated periodically is generated.

90. The program storing medium according to claim 89, wherein in said generating step, said send data including said data encrypted using said key data appropriate to an update period, in said data encrypted using said key data for a plurality of update periods given together in advance is generated.

91-218. -218. (canceled)