Patents Represented by Attorney, Agent or Law Firm Parker & Wendel L.L.P.
  • Optical disk reading device using both a decipher key and disk identification information for decryption
    Patent number: 6408285
    Abstract: A device for reading encrypted information from an optical disk having first and second recording areas, which device can read encrypted information recorded by a first modulation method in the first recording area, read disk identification information recorded by a second modulation method in the second recording area, and decrypt the encrypted information using both a decipher key and disk identification information unique to the optical disk.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: June 18, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuaki Oshima, Yoshino Gotoh, Shinichi Tanaka, Kenji Koishi, Mitsurou Moriya, Yoshinari Takemura