Recording medium, recorder, reproducer, cryptocommunication system and program license system
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuaki Oshima, Yoshiho Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
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Abstract
The operating and other procedures of a disk or recording medium application system of the type for which a network is used are simplified. Disks or recording media have auxiliary data recording areas, where different IDs for individual disk, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, and using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
Claims4
A content recording method for recording encrypted content on a recording medium having stored therein certain information, the method comprising:
- inputting a content;
- encrypting the inputted content;
- certifying validity of the recording medium based on the certain information which is information based on an identifier of the recording medium;
- and
- recording the encrypted content on the recording medium after certifying validity of the recording medium.
A content recording method comprising:
- inputting a content;
- encrypting the inputted content;
- and
- recording the encrypted content, wherein
- after validity of a recording medium based on a certain information is certified, the encrypted content is recorded on said recording medium, and
- the certain information is information based on an identifier of the recording medium on which the encrypted content is recorded.
Dependencies are inferred from the claim text.