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US 6,633,853 B2Granted
Recordable optical disk encrypted with disk identification and multiple keys
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuaki Oshima, Yoshiho Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura
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Abstract
An optical disk recordable by a recording device and having first and second recording areas, the second recording area having recorded therein disk identification information unique to the disk, and multiple cipher keys, the first recording area being capable of having recorded therein information that is encrypted by using the disk identification information and one of the multiple cipher keys during recording.
Claims4
An optical disk recordable by a recording device comprising:
- a recordable first recording are;
- and
- a second recording area having recorded therein at least disk identification information unique to said disk wherein the disk identification information is readable with an optical head which reads information recorded in the first recording area,
- and multiple cipher keys,
- wherein information encrypted using both said disk identification information and at least one of said multiple cipher keys is recordable in said first recording area.
2 more elements
Dependencies are inferred from the claim text.