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Data copyright management method

  • US 6,097,818 A
  • Filed: 07/03/1997
  • Issued: 08/01/2000
  • Est. Priority Date: 10/27/1994
  • Status: Expired due to Term
First Claim
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1. A data copyright management method used for producing new data by editing original data wherein,a broadcast station supplies a plurality of original data encrypted using a first secret-key, to a primary user;

  • said primary user makes a request of use for said plurality of original data to a copyright management center;

    said copyright management center sends said first secret-key and a second secret-key of each of said original data to said primary user;

    said primary user decrypts said plurality of original data encrypted, by using said first secret-key;

    said primary user produces new data which is produced from a plurality of edited data by editing said plurality of original data using an edit program;

    said primary user encrypts said plurality of edited data respectively by said second secret-key of each said original data, and performs a digital signature on editing process data of said edit program, and supplies both said plurality of edited data and said editing process data with said digital signature to a secondary user;

    said secondary user requests use of said new data by presenting said editing process data with said digital signature to said copyright management center;

    said copyright management center confirms an editor as said primary user from said digital signature, and provides said secondary user with said second secret-key of each said original data; and

    said secondary user decrypts said plurality of edited data which have been encrypted, respectively by using said second secret-key of each said original data, and obtains said new data from said plurality of edited data by using said edit program and said editing process data.

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