Information recording medium, information recording device, information reproduction device, information delivery device, their methods, their programs, and recording medium recording programs thereon
First Claim
1. An information recording medium recording contents encrypted using a content encryption key, and a content decryption key used for decrypting the encrypted contents and encrypted by an encryption key for decryption key, wherein the encryption key for decryption key is different for each of the regions preset for at least controlling the permission and inhibition of playback of the contents, the content encryption key and the content decryption key are established corresponding to each of the regions where the content playback is permitted, or corresponding to the combination of the regions where content playback is permitted.
1 Assignment
0 Petitions
Accused Products
Abstract
Contents encrypted by content encryption keys AER1, AER34 and content decryption keys ADR1, ADR34 encrypted by encryption keys BE4, BE6, BE7 are recorded on recording media 301, 302. The encryption keys BE4, BE6, BE7 differ among playback regions 1 to 4 preset to control the permission and inhibition of content playback. Content playback regions can be limited by using only the encryption keys of regions where playback is permitted. Even if a key is leaked out, the other playback regions are not affected because the encryption keys differ among playback regions and therefore the copyright protection function is increased.
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Citations
22 Claims
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1. An information recording medium recording contents encrypted using a content encryption key, and a content decryption key used for decrypting the encrypted contents and encrypted by an encryption key for decryption key, wherein
the encryption key for decryption key is different for each of the regions preset for at least controlling the permission and inhibition of playback of the contents, the content encryption key and the content decryption key are established corresponding to each of the regions where the content playback is permitted, or corresponding to the combination of the regions where content playback is permitted.
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10. An information recording device, comprising:
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a content encryption key inputting section for establishing and inputting a content encryption key corresponding to each of the regions where playback of the contents is permitted, or corresponding to combination of the regions where content playback is permitted;
a content decryption key inputting section for establishing and inputting a content decryption key utilized for decrypting the contents encrypted by the content encryption key;
an encryption key for decryption key selecting section for selecting an encryption key for decryption key corresponding to the region where playback of the contents is permitted;
a content encryption section for encrypting the contents utilizing the content encryption key;
a content decryption key encrypting section for encrypting the content decryption key using the encryption key for decryption key, and a recording section for recording at least the encrypted contents and the encrypted content decryption key to an information recording medium.
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11. An information playback device for playing information including contents encrypted utilizing a content encryption key, and a content decryption key used for decrypting the encrypted contents and encrypted by an encryption key for decryption key, comprising:
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a decryption key storing section storing a decryption key for decryption key for decrypting the content decryption key encrypted by the encryption key for decryption key;
a content decryption key decrypting section for decrypting the content decryption key by using the decryption key for decryption key;
a content decrypting section for decrypting the contents by utilizing the content decryption key, and a playback section for playing the decrypted contents, wherein the decryption keys for decryption key is different for each of the regions preset for at least controlling the permission and inhibition of the content playback, the content encryption key and the content decryption key are established corresponding to each of the regions where content playback is permitted, or corresponding to the combination of the regions where content playback is permitted. - View Dependent Claims (12, 13, 14)
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15. An information delivery device comprising:
a delivery section for delivering contents encrypted utilizing a content encryption key, and content decryption key used for decrypting the encrypted contents and encrypted by an encryption key for decryption key.
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16. An information recording method, comprising the steps of:
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obtaining selection information of the regions where playback of the contents is permitted, establishing a content encryption key and a content decryption key corresponding to the selected regions or the combination thereof, obtaining an encryption key for decryption key preset in accordance with the selected region, encrypting the contents utilizing the content encryption key, encrypting the content decryption key using the encryption key for decryption key, and recording the encrypted contents and the encrypted content decryption key to an information recording medium. - View Dependent Claims (17, 19, 21)
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18. An information playback method for playing information including contents encrypted utilizing a content encryption key, and a content decryption key used for decrypting the encrypted contents and encrypted by an encryption key for decryption, wherein
the decryption key for decryption key is different for each of the regions preset at least for controlling the permission and inhibition of the content playback, the content encryption key and the content decryption key are established corresponding to the each of the regions where content playback is permitted or, in accordance with the combination of regions where content playback is permitted, the method comprising the steps of: -
checking whether or not an information playback device has a decryption key for decryption key corresponding to the encryption key for decryption key encrypting the content decryption key, decrypting the content decryption key using the decryption key for decryption key when the information playback device has the corresponding decryption key for decryption key, decrypting the contents utilizing the decrypted content decryption key, and playing the decrypted contents. - View Dependent Claims (20, 22)
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Specification