Digital work protection system, record/playback device, recording medium device, and model change device
First Claim
1. A digital work protection system for recording and playing back digital works, comprising:
- a portable recording medium device including a storage area;
and a record/playback device being usable under a contract between a user and a service provider, the record/playback device including;
an internal storage unit that stores a content that is a digital work;
a unique information storage unit that prestores device unique information to generate encrypted information, the device unique information indicating the record/playback device and being protected from being written over with an external device of the record/playback device;
an encryption unit that, when the stored content is written from the internal storage unit to the portable recording medium device, encrypts the stored content based on the prestored device unique information to generate encrypted information;
a write unit that writes the generated encrypted information into the storage area of the portable recording medium device;
a read unit operable to read the encrypted information from the storage area of the portable recording medium device;
a decryption unit that decrypts the read encrypted information based on the prestored device unique information stored in the unique information storage unit to generate a decrypted content;
a playback unit that plays back the generated decrypted content;
wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, wherein a model change device replaces the record/playback device with another record/playback device due to a change in the contract between the user and the service provider, the device unique information stored in the unique information storage unit is read, the device unique information is deleted from the unique information storage unit and the read device unique information is written into the other record/playback device.
2 Assignments
0 Petitions
Accused Products
Abstract
A system includes of a main device and a recording medium device. The main device includes a reception unit that receives a digital work from an external distribution server, an internal storage area for storing the digital work, a playback unit that plays back the digital work, and a unique information storage area for storing information that is unique to the main device. The main device also includes an encryption unit that encrypts the digital work using the unique information, a decryption unit that decrypts, using the unique information, the encrypted digital work having been read from the recording medium device, a write unit that writes the encrypted digital work into the recording medium device which is portable, and a read unit that reads the encrypted digital work from the recording medium device.
33 Citations
26 Claims
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1. A digital work protection system for recording and playing back digital works, comprising:
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a portable recording medium device including a storage area; and a record/playback device being usable under a contract between a user and a service provider, the record/playback device including; an internal storage unit that stores a content that is a digital work; a unique information storage unit that prestores device unique information to generate encrypted information, the device unique information indicating the record/playback device and being protected from being written over with an external device of the record/playback device; an encryption unit that, when the stored content is written from the internal storage unit to the portable recording medium device, encrypts the stored content based on the prestored device unique information to generate encrypted information; a write unit that writes the generated encrypted information into the storage area of the portable recording medium device; a read unit operable to read the encrypted information from the storage area of the portable recording medium device; a decryption unit that decrypts the read encrypted information based on the prestored device unique information stored in the unique information storage unit to generate a decrypted content; a playback unit that plays back the generated decrypted content; wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, wherein a model change device replaces the record/playback device with another record/playback device due to a change in the contract between the user and the service provider, the device unique information stored in the unique information storage unit is read, the device unique information is deleted from the unique information storage unit and the read device unique information is written into the other record/playback device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15)
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11. A digital work protection system for recording and playing back digital works, the digital work protection system comprising:
a portable recording medium device being usable under a contract between a user and a service provider, the record/playback device including; an internal storage unit that stores a content that is a digital work; a unique information storage unit that prestores device unique information to generate encrypted information, the device unique information indicating the record/playback device and being protected from being written over with an external device of the record/playback device; an authentication judgment unit operable to judge whether the portable recording medium device includes a second authentication unit; a first authentication unit that performs mutual authentication with the second authentication unit in the portable recording medium, if the portable recording medium includes the second authentication unit; an encryption unit that (i) generates a title key that is unique to the content, encrypts the generated title key using the prestored device unique information as a key to generate an encrypted title key, encrypts the stored content using the generated title key as a key to generate an encrypted content, and generates encrypted information that includes the encrypted title key and the encrypted content, if the portable recording medium is judged to include the second authentication unit and (ii) encrypts the stored content using the prestored device unique information as a key to generate the encrypted information, if the portable recording medium device is judged not to include the second authentication unit; a write unit that writes the generated encrypted information into the storage area of the portable recording medium device; a read unit that reads the encrypted information from the storage area of the portable recording medium device; a decryption unit that (i) decrypts the encrypted title key included in the read encrypted information using the prestored device unique information as a key to generate a decrypted title key, and decrypts the encrypted content included in the read encrypted information using the decrypted title key as a key to generate the decrypted content, if the portable recording medium device is judged to include the second authentication unit, and (ii) decrypt the read encrypted information using the prestored device unique information as a key, if the portable recording medium device is judged not to include the second authentication unit, wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, wherein a model change device replaces the record/playback device with another record/playback device due to a change in the contract between the user and the service provider, the device unique information stored in the unique information storage unit is read, the device unique information is deleted from the unique information storage unit and the read device unique information is written into the other record/playback device.
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16. A record/playback device for recording content that is a digital work into a portable recording medium device and for playing back the content, the record/playback device being usable under a contract between a user and a service provider, the record/playback device comprising:
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an internal storage unit that stores a content that is a digital work; a unique information storage unit that prestores device unique information to generate encrypted information, the device unique information indicating the record/playback device and being protected from being written over with an external device of the record/playback device; an encryption unit that, when the stored content is written from the internal storage unit to the portable recording medium device, encrypts the stored content based on the prestored device unique information to generate encrypted information; a write unit that writes the generated encrypted information into the storage area of the portable recording medium device; a read unit operable to read the encrypted information from the storage area of the portable recording medium device; a decryption unit that decrypts the read encrypted information based on the prestored device unique information stored in the unique information storage unit to generate a decrypted content; a playback unit that plays back the generated decrypted content; wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, wherein a model change device replaces the record/playback device with another record/playback device due to a change in the contract between the user and the service provider, the device unique information stored in the unique information storage unit is read, the device unique information is deleted from the unique information storage unit and the read device unique information is written into the other record/playback device. - View Dependent Claims (17, 18, 19)
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20. A model change device for replacing a first record/playback device with a second record/playback device due to change in a contract between a user and a service provider, the first record/playback device being usable under the contract, wherein
the first record/playback device includes: -
a first internal storage unit that stores a content that is a digital work; a first unique information storage unit that prestores first device unique information to generate first encrypted information, the first device unique information indicating the first record/playback and being protected from being written over with an external device of the first record/playback device other than the model change device; a first encryption unit that, when the stored content is written from the first internal storage unit to a recording medium device, encrypts the content stored in the first internal storage unit based on the first device unique information stored in the first unique information storage unit to generate the first encrypted information; a first write unit that writes the generated first encrypted information into a storage area of the recording medium device; a first read unit that reads the first encrypted information from the storage area of the recording medium device to the first record/playback device; a first decryption unit that decrypts the read first encrypted information based on the first device unique information stored in the first unique information storage unit to generate a decrypted content; and a first playback unit that plays back the generated decrypted content, wherein the first encrypted information is neither decrypted nor played back by any device other than the first record/playback device generating the first encrypted information, and the second record/playback device includes; a second internal storage unit that stores a content that is a digital work; a second unique information storage unit that prestores second device unique information to generate second encrypted information, the second device information indicating the second record/playback device and being protected from being written over with an external device of the second record/playback device; a second encryption unit that, when the stored content is written from the second internal storage unit to the recording medium device, encrypts the content stored in the second internal storage unit based on the second device unique information stored in the second unique information storage unit to generate the second encrypted information; a second write unit that writes the generated second encrypted information into the storage area of the recording medium device; a second read unit that reads the second encrypted information from the storage area of the recording medium device to the second record/playback device; a second decryption unit that decrypts the read second encrypted information based on the second device unique information stored in the second unique information storage unit to generate a decrypted content; and a second playback unit that plays back the generated decrypted content, wherein the second encrypted information is neither decrypted nor played back by any device other than the second record/playback device generating the second encrypted information, the model change device comprising; a third read unit that reads the first device unique information stored in the first unique information storage unit, and deletes the first device unique information from the first unique information storage unit; and a third write unit that writes the read first device unique information into the second unique information storage unit upon the deletion of the first device unique information from the first unique information storage unit. - View Dependent Claims (21, 22)
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23. A model change device for canceling a record/playback device that has been usable under a contract between a user and a service provider, wherein
the record/playback device includes: -
an internal storage unit that stores a content that is a digital work; a unique information storage unit that prestores (i) device unique information to generate encrypted information, the device unique information indicating the record/playback device and (ii) contract information regarding the contract, the device unique information being independent of the contract information, the device unique information being protected from being written over with an external device of the record/playback device; an encryption unit that, when the stored content is written from the internal storage unit to a recording medium device, encrypts the content stored in the internal storage unit based on the device unique information stored in the unique information storage unit to generate the encrypted information; a write unit that writes the generated encrypted information into a storage area of the recording medium device; a read unit that reads the encrypted information from the storage area of the recording medium device to the record/playback device; a decryption unit that decrypts the read encrypted information based on the device unique information stored in the unique information storage unit to generate a decrypted content; and a playback unit that plays back the generated decrypted content, wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, the model change device comprising; a read unit that reads the contract information from the unique information storage unit; and a cancellation unit that performs processing to cancel the contract with reference to the read contract information.
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24. A model change device for changing a first contract under which a record/playback device is usable to a second contract, the first contract being between a user and a first service provider and the second contract being between the user and a second service provider, wherein
the record/playback device includes: -
an internal storage unit that stores a content, the content being a digital work; a unique information storage unit that stores (i) device unique information to generate encrypted information, the device unique information indicating the record/playback device and (ii) first contract information regarding the first contract, the device unique information being independent of the first contract information, the device unique information being protected from being written over with an external device of the record/playback device; an encryption unit that, when the stored content is written from the internal storage unit to a recording medium device, encrypts the content stored in the internal storage unit based on the device unique information stored in the unique information storage unit to generate the encrypted information; a write unit that writes the generated encrypted information into a storage area of the recording medium device; a read unit that reads the encrypted information from the storage area of the recording medium device to the record/playback device; a decryption unit that decrypts the read encrypted information based on the device unique information stored in the unique information storage unit to generate a decrypted content; and a playback unit that plays back the generated decrypted content, wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, the model change device comprising; a read unit that reads the first contract information from the unique information storage unit; a contract cancellation and change unit that performs processing to cancel the first contract with reference to the read first contract information, and performs processing to make the second contract and to generate second contract information regarding the second contract; and a write unit that writes the generated second contract information into the unique information storage unit, and deletes the first contract information from the unique information storage unit.
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25. A record and playback method for a record/playback device that stores a content into a portable recording medium device, the content being a digital work, and plays back the content from the portable recording medium device, the recording medium device including a storage area and being attached to the record/playback device, the record/playback device being usable under a contract between a user and a service provider, the record and playback method comprising:
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storing the content in an internal storage unit; prestoring device unique information to generate encrypted information in a unique information storage unit, the device unique information indicating the record/playback device and being protected from being written over with an external device of the record/playback device; the record and playback method comprising; encrypting the stored content based on the prestored device unique information to generate the encrypted information when the stored content is written from the internal storage unit to the portable recording medium device; writing the generated encrypted information into the storage area of the recording medium device; reading the encrypted information from the storage area of the recording medium device to the record/playback device; decrypting the read encrypted information based on the prestored device unique information stored in the unique information storage unit to generate a decrypted content; and
playing back the generated decrypted content,wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, wherein a model change device replaces the record/playback device with another record/playback device due to a change in the contract between the user and the service provider, the device unique information stored in the unique information storage unit is read, the device unique information is deleted from the unique information storage unit and the read device unique information is written into the other record/playback device.
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26. A computer readable recording medium storing a record and playback program for a record/playback device, the record/playback device storing a content into a portable recording medium device, the content being a digital work, and the record/playback device playing back the content, the record/playback device being usable under a contract between a user and a service provider,
the record and playback program comprising: -
an encryption operation of encrypting the content stored in an internal storage unit of the record/playback device based on prestored device unique information to generate encrypted information, the device unique information indicating the record/playback device and stored in a unique information storage unit of the record/playback device, to generate encrypted information, the device unique information being protected from being written over with an external device of the record/playback device; a write operation of writing the generated encrypted information into a storage area of the recording medium device; a read operation of reading the encrypted information from the storage area of the recording medium device to the record/playback device; a decryption operation of decrypting the read encrypted information based on the prestored device unique information stored in the unique information storage unit to generate a decrypted content; and a playback operation of playing back the generated decrypted content, wherein the encrypted information is neither decrypted nor played back by any device other than the record/playback device generating the encrypted information, wherein a model change device replaces the record/playback device with another record/playback device due to a change in the contract between the user and the service provider, the device unique information stored in the unique information storage unit is read, the device unique information is deleted from the unique information storage unit and the read device unique information is written into the other record/playback device.
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Specification