Apparatus and method for preventing unauthorized use of information recorded on an information recording medium
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Ueda, Yoshihisa Fukushima, Motoshi Ito, Makoto Tatebayashi, Natsume Matsuzaki
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Abstract
An information recording medium includes a lead-in area and a data recording area. Key information is recorded in the lead-in area. Scrambled data is recorded in the data recording area. The scrambled data is descrambled based on the key information.
Claims28
An information recording medium comprising a lead-in area not accessible by devices other than a disk reproducing device and a data recording area, wherein
- key information is recorded in the lead-in area,
- scrambled data is recorded in the data recording area, and
- the scrambled data is descrambled based on the key information.
An information recording medium comprising a lead-in area not accessible by devices other than a disk reproducing device and a data recording area, wherein
- first key information is recorded in the lead-in area,
- a plurality of second key information and scrambled data are recorded in the data recording area, and
- a portion of the scrambled data is descrambled based on information obtained by converting one of the plurality of second key information based on the first key information.
An information reproducing device comprising:
- a reading circuit for reading scrambled data and key information to be used for descrambling the scrambled data from an information recording medium;
- and
- an authentication circuit for authenticating to transmit information corresponding to the key information to the decoding device before transmitting the scrambled data to the decoding device including a descramble circuit for descrambling the scrambled data.
An information reproducing device comprising:
- an authentication circuit for authenticating to receive information corresponding to key information from a reading device before receiving scrambled data from the reading device for reading the scrambled data and the key information to be used for descrambling the scrambled data from an information recording medium;
- and
- a descramble circuit for descrambling the scrambled data received from the reading device.
An information reproducing device comprising:
- a reading circuit for reading scrambled data and key information to be used for descrambling the scrambled data from an information recording medium;
- a decoding section including a descramble circuit for descrambling the scrambled data;
- and
- an authentication circuit for authenticating to transmit information corresponding to the key information to the decoding section before transmitting the scrambled data to the decoding section.
An information reproduction method for reproducing scrambled data using a reading device for reading scrambled data and key information to be used for descrambling the scrambled data from an information recording medium and a decoding device including a descramble circuit for descrambling the scrambled data, the method comprising the steps of:
- performing mutual authentication processing between the reading device and the decoding device;
- generating bus key information common to the reading device and the decoding device in the case where the mutual authentication processing is normally ended between the reading device and the decoding device;
- encrypting the key information in accordance with the bus key information;
- and
- transmitting the encrypted key information from the reading device to the decoding device.
Dependencies are inferred from the claim text.