Backup Management Device, Backup Management Method, Computer Program, Recording Medium, Integrated Circuit, and Backup System
First Claim
1. A backup management device comprising:
- a first storage unit that stores a content;
a secure storage unit that stores playback right information showing a right to play back the content;
a second storage unit that stores a backup of the content;
an acquisition unit operable to acquire an instruction to delete the content so as to be restorable; and
a deletion unit operable, if the instruction is acquired, to delete the content without deleting the playback right information.
2 Assignments
0 Petitions
Accused Products
Abstract
To provide a backup management device that deletes a content so as to be restorable in the future while protecting a copyright of the content, in a case where there exists a backup of the content. In an HD recorder 100, a first information storage unit 102 stores a content, a second information storage unit 103 stores a backup of the content, a secure storage unit 104 stores a hash value of the content. If receiving an instruction to delete the content so as to be restorable, a control unit 113 deletes the content from the first information storage unit 102. When the content is played back, an encryption processing unit 109 applies a calculation to the content to generate detection information, and the control unit 113 compares the hash value with the detection information to judge whether the content has been tampered.
-
Citations
19 Claims
-
1. A backup management device comprising:
-
a first storage unit that stores a content; a secure storage unit that stores playback right information showing a right to play back the content; a second storage unit that stores a backup of the content; an acquisition unit operable to acquire an instruction to delete the content so as to be restorable; and a deletion unit operable, if the instruction is acquired, to delete the content without deleting the playback right information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A backup management method for use in a backup management device,
the backup management device comprising: -
a first storage unit that stores a content; a secure storage unit that stores playback right information showing a right to play back the content; a second storage unit that stores a backup of the content; the backup management method comprising the steps of; acquiring an instruction to delete the content so as to be restorable; and deleting, if the instruction is acquired, the content without deleting the playback right information.
-
-
13. A computer program for use in a backup management device,
the backup management device comprising: -
a first storage unit that stores a content; a secure storage unit that stores playback right information showing a right to play back the content; a second storage unit that stores a backup of the content; the computer program causing a computer to perform the steps of; acquiring an instruction to delete the content so as to be restorable; and deleting, if the instruction is acquired, the content without deleting the playback right information. - View Dependent Claims (14)
-
-
15. An integrated circuit for use in a backup management device,
the backup management device comprising: -
a first storage unit that stores a content; a secure storage unit that stores playback right information showing a right to play back the content; a second storage unit that stores a backup of the content; the integrated circuit comprising the steps of; acquiring an instruction to delete the content so as to be restorable; and deleting, if the instruction is acquired, the content without deleting the playback right information.
-
-
16. A backup system comprising a recording/playback device that stores and plays back a content and a backup device that manages a backup of the content, wherein
the backup device stores the backup, the recording/playback device comprises: -
a storage unit that stores the content; a secure storage unit that stores playback right information showing a right to play back the content; an acquisition unit operable to acquire an instruction to delete the content so as to be restorable; and a deletion unit operable, if the instruction is acquired, to delete the content without deleting the playback right information, nor instructing the backup system to delete the backup. - View Dependent Claims (17, 18)
-
-
19. A backup management device that manages a backup of a content, comprising
a specific key storage unit that stores a specific key for each device; -
a secure storage unit that stores playback right information showing a right to play back the content; a transfer request receiving unit operable to receive a transfer request of the backup from a request device that stores a first decryption key for decrypting a cyphertext encrypted using a first encryption key; an encrypted key acquisition unit operable, from a backup device that stores an encrypted key and the backup that has been encrypted, to acquire the encrypted key, the encrypted key being encrypted so as to be decrypted into a second decryption key for decrypting the encrypted backup using the specific key; a re-encrypted key generation unit operable to generate a re-encrypted key by decrypting the acquired encrypted key using the specific key to generate the second decryption key, and encrypting the generated second decryption key using the first encryption key; an instruction unit operable to transmit the re-encrypted key to the backup device to instruct the backup device to rewrite the encrypted key stored therein to the re-encrypted key; and a deletion unit operable to delete the playback right information from the secure storage unit.
-
Specification