Patent ID: 6097818
Filing Date: 2000-08-01
Classification: G06F,H04L,H04N

Abstract:
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; andsaid 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.