Information access control method and apparatus
First Claim
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1. A recording method in which objects of different kinds are respectively encrypted using an individual key, and encrypted object data is recorded on an information medium, said recording method comprising:
- generating the individual key at the time of starting one recording;
encrypting one or more the objects using the generated key; and
recording data of one or more the encrypted objects on the information medium.
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Abstract
According to one embodiment, an access management system such as an AACS is used to protect highly confidential information. A new key is generated at the time of starting one recording. This key is used to encrypt an object which is the object obtained by encoding the recording target according to a predetermined method or is the object of the recording target itself. When this object is divided during recording, the same key is used for the one recording processing.
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6 Claims
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1. A recording method in which objects of different kinds are respectively encrypted using an individual key, and encrypted object data is recorded on an information medium, said recording method comprising:
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generating the individual key at the time of starting one recording;
encrypting one or more the objects using the generated key; and
recording data of one or more the encrypted objects on the information medium. - View Dependent Claims (2, 3, 5)
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4. A method for reproducing encrypted object data from an information medium wherein the encrypted object data is encrypted using a key which is configured to be changed for each recording, said reproducing method comprising:
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reading information relating to an encryption from the information medium;
generating a decryption key corresponding to said individual key from the read encryption-related information; and
decrypting and reproducing data of the encrypted object from the information medium according to the generated decryption key.
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6. An apparatus for reproducing object data from an information medium wherein the object data is encrypted using a key which is configured to be changed for each recording, said reproducing apparatus comprising:
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a reader configured to read management information of the object data from the information medium;
a generator configured to read information relating to an encryption from the information medium, to thereby generate a decryption key; and
a decrypting reproducer configured to decrypt and reproduce data of the encrypted object from the information medium according to the generated decryption key and to the read management information.
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Specification