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, the digital work protection system comprising:
- a portable recording medium device including a storage area; and
a record/playback device including;
an internal storage unit operable to store a content that is a digital work;
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device;
an encryption unit operable to encrypt the stored content based on the prestored device unique information to generate encrypted information;
a write unit operable to write 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 operable to decrypt 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 unit operable to play back the generated decrypted content.
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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.
59 Citations
32 Claims
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1. A digital work protection system for recording and playing back digital works, the digital work protection system comprising:
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a portable recording medium device including a storage area; and
a record/playback device including;
an internal storage unit operable to store a content that is a digital work;
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device;
an encryption unit operable to encrypt the stored content based on the prestored device unique information to generate encrypted information;
a write unit operable to write 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 operable to decrypt 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 unit operable to play back the generated decrypted content. - 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:
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a portable recording medium device including a storage area; and
a record/playback device including;
an internal storage unit operable to store a content that is a digital work;
a unique information storage unit operable to prestore device unique information that is unique to 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 operable to perform 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 operable to (i) generate a title key that is unique to the content, encrypt the generated title key using the prestored device unique information as a key to generate an encrypted title key, encrypt the stored content using the generated title key as a key to generate an encrypted content, and generate encrypted information that is composed of the encrypted title key and the encrypted content, if the portable recording medium is judged to include the second authentication unit, and (ii) encrypt 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 operable to write 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; and
a decryption unit operable to (i) decrypt 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 decrypt 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.
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16. A record/playback device for recording a content that is a digital work into a portable recording medium device and for playing back the content, the record/playback device comprising:
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an internal storage unit operable to store a content that is a digital work;
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device;
an encryption unit operable to encrypt the stored content based on the prestored device unique information to generate encrypted information;
a write unit operable to write the generated encrypted information into a 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 operable to decrypt 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 unit operable to play back the generated decrypted content. - View Dependent Claims (17, 18, 19)
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20. A portable recording medium device that includes a storage area for storing encrypted information and that is attached to a record/playback device, wherein
the record/playback device includes: -
an internal storage unit operable to store a content that is a digital work;
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device;
an encryption unit operable to encrypt the stored content based on the prestored device unique information to generate encrypted information;
a write unit operable to write 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 operable to decrypt 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 unit operable to play back the generated decrypted content. - View Dependent Claims (21, 22, 23)
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24. 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 operable to store a content that is a digital work;
a first unique information storage unit operable to prestore device unique information that is unique to the first record/playback device;
a first encryption unit operable to encrypt the content stored in the first internal storage unit based on the device unique information stored in the first unique information storage unit to generate encrypted information;
a first write unit operable to write the generated encrypted information into a storage area of a recording medium device;
a first read unit operable to read the encrypted information from the storage area of the recording medium device;
a first decryption unit operable to decrypt the read encrypted information based on the device unique information stored in the first unique information storage unit to generate a decrypted content; and
a first playback unit operable to play back the generated decrypted content, and the second record/playback device includes;
a second internal storage unit including an internal storage area for storing a content that is a digital work;
a second unique information storage unit including an internal storage area for storing device unique information;
a second encryption unit operable to encrypt the content stored in the second internal storage unit based on the device unique information stored in the second unique information storage unit to generate encrypted information;
a second write unit operable to write the generated encrypted information into the storage area of the recording medium device;
a second read unit operable to read the encrypted information from the storage area of the recording mediumdevice;
a second decryption unit operable to decrypt the read encrypted information based on the device unique information stored in the second unique information storage unit to generate a decrypted content; and
a second playback unit operable to play back the generated decrypted content, the model change device comprising;
a third read unit operable to read the device unique information stored in the first unique information storage unit, and delete the device unique information from the first unique information storage unit; and
a third write unit operable to write the read device unique information into the second unique information storage unit. - View Dependent Claims (25, 26)
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27. 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 operable to store a content that is a digital work;
a unique information storage unit operable to prestore (i) device unique information that is unique to the record/playback device and (ii) contract information regarding the contract, the device unique information being independent of the contract information;
an encryption unit operable to encrypt the content stored in the internal storage unit based on the device unique information stored in the unique information storage unit to generate encrypted information;
a write unit operable to write the generated encrypted information into a storage area of a recording medium device;
a read unit operable to read the encrypted information from the storage area of the recording medium device;
a decryption unit operable to decrypt 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 operable to play back the generated decrypted content, the model change device comprising;
a read unit operable to read the contract information from the unique information storage unit; and
a cancellation unit operable to perform processing to cancel the contract with reference to the read contract information.
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28. 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 operable to store a content that is a digital work;
a unique information storage unit operable to store (i) device unique information that is unique to the record/playback device and (ii) first contract information regarding the first contract, the device unique information being independent of the first contract information;
an encryption unit operable to encrypt the content stored in the internal storage unit based on the device unique information stored in the unique information storage unit to generate encrypted information;
a write unit operable to write the generated encrypted information into a storage area of a recording medium device;
a read unit operable to read the encrypted information from the storage area of the recording medium device;
a decryption unit operable to decrypt 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 operable to play back the generated decrypted content, the model change device comprising;
a read unit operable to read the first contract information from the unique information storage unit;
a contract cancellation and change unit operable to perform processing to cancel the first contract with reference to the read first contract information, and perform processing to make the second contract and to generate second contract information regarding the second contract; and
a write unit operable to write the generated second contract information into the unique information storage unit, and delete the first contract information from the unique information storage unit.
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29. 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 operable to store a content that is a digital work;
a first unique information storage unit operable to prestore device unique information that is unique to the user, the first unique information storage unit being detachable from the first record/playback device;
a first encryption unit operable to encrypt the content stored in the first internal storage unit based on the prestored device unique information stored in the first unique information storage unit to generate encrypted information;
a first write unit operable to write the generated encrypted information into a storage area of a recording medium device;
a first read unit operable to read the encrypted information from the storage area of the recording medium device;
a first decryption unit operable to decrypt the read encrypted information based on the prestored device unique information stored in the first unique information storage unit to generate a decrypted content; and
a first playback unit operable to play back the generated decrypted content, and the second record/playback device includes;
a second internal storage unit including an internal storage area for storing a content that is a digital work;
a second encryption unit operable to encrypt the content stored in the second internal storage unit based on the prestored device unique information stored in the first unique information storage unit to generate encrypted information;
a second write unit operable to write the generated encrypted information into the storage area of the recording medium device;
a second read unit operable to read the encrypted information from the storage area of the recording medium device;
a second decryption unit operable to decrypt the read encrypted information based on the prestored device unique information stored in the first unique information storage unit to generate a decrypted content; and
a second playback unit operable to play back the generated decrypted content, the model change device comprising an attachment and detachment unit operable to detach the first unique information storage unit from the first record/playback device and attach the detached first unique information storage unit to the second record/playback device.
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30. A record and playback method for a record/playback device that stores a content being a digital work into a portable recording medium device and plays back the content,
the recording medium device including a storage area and being attached to the record/playback device, and the record/playback device including: -
an internal storage unit operable to store a content that is a digital work; and
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device, the record and playback method comprising;
an encryption operation of encrypting the stored content based on the prestored device unique information to generate encrypted information;
a write operation of writing the generated encrypted information into the storage area of the recording medium device;
a read operation of reading the encrypted information from the storage area of the recording medium 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.
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31. A record and playback program stored on a computer readable recording medium for a record/playback device that stores a content being a digital work into a portable recording medium device and plays back the content,
the recording medium device including a storage area and being attached to the record/playback device, and the record/playback device including: -
an internal storage unit operable to store a content that is a digital work; and
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device, the record and playback program comprising;
an encryption operation of encrypting the stored content based on the prestored device unique information to generate encrypted information;
a write operation of writing the generated encrypted information into the storage area of the recording medium device;
a read operation of reading the encrypted information from the storage area of the recording medium 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.
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32. A record and playback computer data signal for a record/playback device that stores a content being a digital work into a portable recording medium device and plays back the content,
the recording medium device including a storage area and being attached to the record/playback device, and the record/playback device including: -
an internal storage unit operable to store a content that is a digital work; and
a unique information storage unit operable to prestore device unique information that is unique to the record/playback device, the record and playback data signal comprising;
an encryption code segment for encrypting the stored content based on the prestored device unique information to generate encrypted information;
a write code segment for writing the generated encrypted information into the storage area of the recording medium device;
a read code segment for reading the encrypted information from the storage area of the recording medium device;
a decryption code segment for 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 code segment for playing back the generated decrypted content.
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Specification