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Software delivery system, center device, relaying device and user terminal device

  • US 5,680,453 A
  • Filed: 08/03/1995
  • Issued: 10/21/1997
  • Est. Priority Date: 08/10/1994
  • Status: Expired due to Term
First Claim
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1. A software deliver system comprising:

  • a center for ciphering specified software in accordance with an attribute of the software and providing the ciphered specified software to a user using a specified form of delivery, said center is provided with;

    ciphering key generating means for generating a ciphering key used to cipher the specified software in accordance with the attribute of the specified software;

    first utilization mode identifying means for determining a ciphering mode based on the specified form of delivering the ciphered specified software; and

    ciphering processing means for ciphering the ciphered specified software in accordance with the ciphering key and the ciphering mode identified by said first utilization mode identifying means; and

    a user terminal device provided with;

    deciphering key generating means for generating a deciphering key used to decipher the ciphered specified software based on the attribute of the specified software;

    second utilization mode identifying means for identifying the ciphering mode of the ciphered specified software; and

    deciphering processing means for deciphering the ciphered specified software based on the deciphering key and the ciphering mode identified by said second utilization mode identifying means.

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