Storage-medium processing method, storage-medium processing device, and program
First Claim
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1. A storage medium processing method using a storage medium and a user terminal, the method comprising:
- storing, in the storage medium, medium identifier data, medium unique key data generated based on the medium identifier data, encrypted user key data in which user key data is encrypted so that the encrypted user key data may be decrypted using the medium unique key data, and encrypted content key data in which content key data is encrypted so that the encrypted content key data may be decrypted using the user key data;
storing, in the storage medium, the encrypted user key data in a protection area, and storing the encrypted content key data in a user data area, the storage medium including the protection area in which data read/write is permitted from outside of the storage medium in response to authentication being accomplished, and including the user data area in which data read/write is permitted from outside of the storage medium;
retaining, in the user terminal, encrypted content data in which content data is encrypted so that the encrypted content data may be decrypted using the content key data; and
accessing, using the user terminal connected to the storage medium, a license center to obtain various kinds of data;
an issuance step of issuing, in response to request from the user terminal, the content key data and the user key data with management data including data of an expiration date of the content key data or the user key data permitting use of the content data before a certain expiration date;
a judgment step of judging whether or not the user key data or the content key data may be used continuously by referring to the management data; and
a deleting/use-precluding step of deleting or precluding usage of the user key data or the content key data based on the judging result of the judgment step,wherein the user key data is issued so as to be shared by plural sets of the content key data, each of the plural sets having the same expiration date as that of the user key data shared among them.
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Abstract
Rental business of content data is adequately performed while preventing a improper use of rights or the like by a user. Rental user key data Kuren1-3, and rental content key data Kuren1-3 includes management metadata M1-M3 and M1′-M3′, respectively. The management metadata includes data use termination date/time indicating an expiration date or the like.
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Citations
13 Claims
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1. A storage medium processing method using a storage medium and a user terminal, the method comprising:
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storing, in the storage medium, medium identifier data, medium unique key data generated based on the medium identifier data, encrypted user key data in which user key data is encrypted so that the encrypted user key data may be decrypted using the medium unique key data, and encrypted content key data in which content key data is encrypted so that the encrypted content key data may be decrypted using the user key data; storing, in the storage medium, the encrypted user key data in a protection area, and storing the encrypted content key data in a user data area, the storage medium including the protection area in which data read/write is permitted from outside of the storage medium in response to authentication being accomplished, and including the user data area in which data read/write is permitted from outside of the storage medium; retaining, in the user terminal, encrypted content data in which content data is encrypted so that the encrypted content data may be decrypted using the content key data; and accessing, using the user terminal connected to the storage medium, a license center to obtain various kinds of data; an issuance step of issuing, in response to request from the user terminal, the content key data and the user key data with management data including data of an expiration date of the content key data or the user key data permitting use of the content data before a certain expiration date; a judgment step of judging whether or not the user key data or the content key data may be used continuously by referring to the management data; and a deleting/use-precluding step of deleting or precluding usage of the user key data or the content key data based on the judging result of the judgment step, wherein the user key data is issued so as to be shared by plural sets of the content key data, each of the plural sets having the same expiration date as that of the user key data shared among them. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A storage medium processing device configured to be connectable to a storage medium which stores medium identifier data, medium unique key data generated based on the medium identifier data, encrypted user key data in which user key data is encrypted so that the encrypted user key data may be decrypted using the medium unique key data, and encrypted content key data in which content key data is encrypted so that the encrypted content key data may be decrypted using the user key data, and performs data processing of the storage medium via a user terminal retaining encrypted content data in which content data is encrypted so that the encrypted content data may be decrypted using the content key data,
the storage medium includes a protection area in which data read/write is permitted from outside of the storage medium in response to authentication being accomplished, and a user data area in which data read/write is permitted from outside of the storage medium, and is configured to store the encrypted user key data in the protection area, and to store the encrypted content key data in the user data area, the device comprising: -
a key issuance unit configured to issue, in response to request from the user terminal, the content key data and the user key data with management data including data of an expiration date of the content key data or the user key data permitting use of the content data before a certain expiration date; and a judgment unit configured to judge whether or not the user key data or the content key data may be used continuously referring to the management data, and conduct an instruction to delete the user key data or the content key data or preclude usage of the user key data or the content key data when the continuous usage thereof is judged improper, wherein the user key data is issued so as to be shared by plural sets of the content key data, each of the plural sets having the same expiration date as that of the user key data shared among them. - View Dependent Claims (8, 9, 10)
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11. A user terminal configured to be connectable to a storage medium which stores medium identifier data, medium unique key data generated based on the medium identifier data, encrypted user key data in which user key data is encrypted so that the encrypted user key data may be decrypted using the medium unique key data, and encrypted content key data in which content key data is encrypted so that the encrypted content key data may be decrypted using the user key data, configured to be enabled to access to a license center to obtain various kinds of data, and configured to retain encrypted content data in which content data is encrypted so that the encrypted content data may be decrypted using the content key data,
the storage medium includes a protection area in which data read/write is permitted from outside of the storage medium in response to authentication being accomplished, and a user data area in which data read/write is permitted from outside of the storage medium, and is configured to store the encrypted user key data in the protection area, and to store the encrypted content key data in the user data area, the user terminal comprising: -
a download unit downloading the content key data and the user key data with management data including data of an expiration date of the content key data or the user key data receiving permission to use the content data before a certain expiration date, a processing unit that writes the encrypted user key data and the content key data in the storage medium or reads the encrypted user key data and the content key data from the storage medium, and deletes or precludes use of the user key data or the content key data having the certain expiration date which elapsed, wherein the user key data is issued so as to be shared by plural sets of the content key data, each of the plural sets having the same expiration date as that of the user key data shared among them. - View Dependent Claims (12, 13)
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Specification
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Current AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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InventorsKasahara, Akihiro, Suu, Hiroshi, Miura, Akira
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Primary Examiner(s)COLIN, CARL G
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Application NumberUS11/571,716Publication NumberTime in Patent Office2,071 DaysField of Search726/26, 380/277US Class Current726/26CPC Class CodesG06F 12/1416 by checking the object acce...G06F 21/109 by using specially-adapted ...G06F 2221/2137 Time limited access, e.g. t...H04L 2209/60 Digital content management,...H04L 9/083 involving central third par...H04L 9/0894 Escrow, recovery or storing...
