Storage medium rental system
First Claim
1. A storage-medium rental system, comprising:
- a rental-shop apparatus that generates right information relating to a right to use digital work held by a portable storage medium, and securely writes the generated right information to a portable semiconductor memory; and
a playback apparatus that securely reads the right information from the semiconductor memory, and judges whether the digital work held by the storage medium is allowed to be used, based on the read right information, and when judging affirmatively, obtains the digital work from the storage medium and plays back the obtained digital work.
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Accused Products
Abstract
A storage-medium rental system includes a portable storage medium to be rented to the user, a portable semiconductor memory owned by the user, a rental-shop apparatus owned by the rental agent, and a playback apparatus owned by the user. The storage medium prestores encrypted content generated by encrypting digital work using a content encryption key. The semiconductor memory has an area f or securely storing a content decryption key. The rental-shop apparatus stores a content decryption key for decrypting the encrypted content. The rental-shop apparatus writes the content decryption key to the semiconductor memory. The playback apparatus securely reads the content decryption key from the semiconductor memory, reads the encrypted content from the storage medium, decrypts the encrypted content using the content decryption key, and plays back the decrypted content.
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Citations
48 Claims
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1. A storage-medium rental system, comprising:
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a rental-shop apparatus that generates right information relating to a right to use digital work held by a portable storage medium, and securely writes the generated right information to a portable semiconductor memory; and
a playback apparatus that securely reads the right information from the semiconductor memory, and judges whether the digital work held by the storage medium is allowed to be used, based on the read right information, and when judging affirmatively, obtains the digital work from the storage medium and plays back the obtained digital work.
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2. A storage-medium rental system in which a rental agent provides, to a user, a portable storage medium holding digital work whose right of use is rented from the rental agent to the user, comprising:
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the portable storage medium that holds the digital work by storing therein digital content data representing the digital work;
a portable semiconductor memory that has an area for securely storing information;
a rental-shop apparatus that, when the rental agent provides the storage medium to the user, generates right information relating to a right to use the digital work held by the storage medium, and securely writes the generated right information into the area of the semiconductor memory; and
a playback apparatus that, upon receipt of an instruction from the user to play back the digital work, securely reads the right information from the area of the semiconductor memory, and judges whether the digital work is allowed to be used, based on the read right information, and when judging affirmatively, reads the digital content data from the storage medium and plays back the digital work based on the read digital content data.
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3. A rental-shop apparatus that manages rental, from a rental agent to a user, of a right to use digital work held by a portable storage medium, comprising:
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an obtaining unit operable to obtain medium identification information identifying the storage medium;
a generation unit operable to generate right information relating to the right to use the digital work, based on the obtained medium identification information; and
a writing unit operable to securely write the generated right information into an area of a portable semiconductor memory. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A playback apparatus that plays back digital work whose right of use is rented from a rental agent to a user, the digital work being held by a portable storage medium, comprising:
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a reading unit operable to securely read right information relating to a right to use the digital work, from an area of a portable semiconductor memory;
a judgment unit operable to judge whether the digital work is allowed to be used, based on the read right information;
an obtaining unit operable to obtain the digital work from the storage medium when the digital work is allowed to be used; and
a playback unit operable to playback the obtained digital work. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A portable semiconductor memory, comprising
a storage unit that has an area for securing storing right information when a rental agent provides a storage medium holding digital work to a user, the right information relating to a right to use the digital work.
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43. A rental method for use in a rental-shop apparatus that manages rental, from a rental agent to a user, of a right to use digital work held by a portable storage medium, comprising:
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an obtaining step of obtaining medium identification information identifying the storage medium;
a generation step of generating right information relating to the right to use the digital work, based on the obtained medium identification information; and
a writing step of securely writing the generated right information into an area of a portable semiconductor memory.
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44. A rental program for use in a computer that manages rental, from a rental agent to a user, of a right to use digital work held by a portable storage medium, comprising:
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an obtaining step of obtaining medium identification information identifying the storage medium;
a generation step of generating right information relating to the right to use the digital work, based on the obtained medium identification information; and
a writing step of securely writing the generated right information into an area of a portable semiconductor memory. - View Dependent Claims (45)
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46. A playback method for use in a playback apparatus that plays back digital work whose right of use is rented from a rental agent to a user, the digital work being held by a portable storage medium, comprising:
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a reading step of securely reading right information relating to a right to use the digital work, from an area of a portable semiconductor memory;
a judgment step of judging whether the digital work is allowed to be used, based on the read right information;
an obtaining step of obtaining the digital work from the storage medium when the digital work is allowed to be used; and
a playback step of playing back the obtained digital work.
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47. A playback program for use in a computer that plays back digital work whose right of use is rented from a rental agent to a user, the digital work being held by a portable storage medium, comprising:
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a reading step of securely reading right information relating to a right to use the digital work, from an area of a portable semiconductor memory;
a judgment step of judging whether the digital work is allowed to be used, based on the read right information;
an obtaining step of obtaining the digital work from the storage medium when the digital work is allowed to be used; and
a playback step of playing back the obtained digital work. - View Dependent Claims (48)
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Specification