Data copyright management system

A data copyright management system for using data encrypted and supplied from a database to a user, said data copyright management system comprising the database, a key control center and a copyright management center,

• wherein said data copyright management system uses secret-key, user information and copyright control program;
• said database encrypts the data with first secret-key to distribute the data to a first user via communication network, communication and broadcasting satellite, and record medium;
• said first user provides the first user information to said key control center to request the use;
• said key control center transfers said first user information to said copyright management center;
• said key control center transfers the copyright control program together with said first secret-key and second secret-key to said first user via said communication network;
• said first user uses said first secret-key with said copyright control program to decrypts aid encrypted data for use;
• and
• said data decrypted is re-encrypted in the case where said decrypted data is stored, copied or transmitted with said copyright control program by using said second secret-key, and uncrypted-first user information is added.

A data copyright management system for using data encrypted and supplied from a database to a user, said data copyright management system comprising a database, a key control center and a copyright management center;

• wherein said data copyright management system uses secret-key, user information and copyright control program;
• first user presents the first user information to the database to request the use of the data;
• said database encrypts requested said data by using first secret-key and transfers it to said first user via said communication network together with said first secret-key, second secret-key and said copyright control program;
• said key control center transfers said first user information to said copyright management center;
• said key control center transfers the copyright control program together with said first and second secret-keys to said first user via said communication network;
• said first user decrypts and uses said encrypted data with said copyright control program by using said first secret-key;
• and
• said data decrypted is re-encrypted when said decrypted data is stored copied or transmitted with said copyright control program by using said second secret-key, and uncrypted first user information is added.

A data copyright management system for using data encrypted and supplied from a database to a user, said data copyright management system comprising a database, a key control center and a copyright management center;

• said data copyright management system uses secret-key, public-key and private-key;
• first user presents first public-key, second public-key and first user information to request the use of the desired data to said key control center;
• said database which receives the request for use encrypts said data by using first secret-key, encrypts said first secret-key by using said first public-key, and encrypts second secret-key by using said second public-key;
• said encrypted data, said encrypted first secret-key, said encrypted second secret-key and said copyright control program are transmitted to said first user;
• said first user decrypts said encrypted first secret-key by using first private-key, decrypts said encrypted data by using said decrypted first secret-key, and decrypts said encrypted second secret-key by using second private-key, with said copyright control program;
• said data is encrypted and decrypted with said copyright control program by using the second secret-key in the case where said decrypted data is stored, copied or transmitted.

A data copyright management system for using a plurality of data encrypted each by different secret-keys and supplied from database to a user, said system using a secret-key, user information and a copyright control program, said data copyright management system comprising:

• first user obtaining from a copyright management center a plurality of copyright control programs unique to original said plurality of data and a plurality of first secret-keys to decrypt said plurality of original data with a plurality of said first secret-keys;
• one or a plurality of second secret-keys being generated with a plurality of copyright control programs unique to said plurality of original data;
• wherein said plurality of original data which are used or edited are encrypted with said one or a plurality of second secret-keys with said plurality of copyright control programs unique to said plurality of original data to be stored, copied or transmitted together with the edition process data;
• and
• said plurality of original data or said plurality of edited data encrypted with said one or plurality of second secret-keys are decrypted with said one or plurality of second secret-keys and said plurality of copyright control programs obtained from said copyright management center for second user to use and edit by using said edition process.

A data copyright management system for using data encrypted and supplied from a database to a user, using a crypt key, user information and a copyright control program, comprising:

• said user presenting user information to said database;
• said database supplying said data encrypted with first crypt key to first user;
• said first user generating a second crypt key based on said first crypt key with said copyright control program;
• said encrypted data being decrypted by using said first crypt key in the case where said first user uses said encrypted data;
• and
• said decrypted data being reencrypted by using said second crypt key in the case where said first user stores, copies or transmits said decrypted data.

A digital cash management system for using digital cash encrypted and supplied from a financial organization to first user, comprising:

• said financial organization supplying a key for decrypting said encrypted digital cash data to said first user;
• said digital cash data being decrypted by using said decrypting key in the case where said first use confirms said digital cash data;
• and
• said data being reencrypted in the lase where said first user stores said decrypted digital cash case where changed digital cash data is stored, or in the case where digital cash data is transmitted to said second user.

A digital cash management system for using digital cash encrypted and supplied from a financial organization to a first user, said system using a crypt key, user information and digital cash management program, comprising:

• said first user presenting the first user information to said financial organization;
• said financial organization providing said first user with said digital cash data encrypted by the first crypt key;
• wherein said first user generates a second crypt key on the basis of said first crypt key with said digital cash management program;
• said encrypted digital cash data is decrypted by using said first crypt key in the case where said first user confirms said encrypted digital cash data;
• said digital cash data decrypted is reencrypted by using said second crypt key to be stored said first user;
• said decrypted digital cash data is reencrypted by using said second crypt key and said digital cash data reencrypted is transmitted to second user together with said first user information in the case where said decrypted digital cash data is transmitted to said second user;
• said first user information is presented to said financial organization from said second user;
• said financial organization generates said second crypt key based on said first user information and transfers said second crypt key to said second user;
• and
• said second user decrypts said reencrypted digital cash data with said digital cash management program by using said second crypt key which is transferred.

A digital cash management system for using a digital cash encrypted and supplied from a financial organization to first user, said system using a public-key and a private-key, comprising:

• said first user presenting first public-key to said financial organization;
• said financial organization encrypting digital cash data with said first public-key to supply to said first user;
• said first user decrypting said digital cash data by using first private-key;
• second user presenting second public-key to said first user;
• said first user encrypting said digital cash data which is decrypted with said second public-key to transfer to said second user;
• and
• said second user decrypting said digital cash data by using second private-key.

A video conference data management system for using video conference data encrypted and supplied from first user to second user, comprising:

• a key for decrypting said encrypted video conference data being supplied from said first user to said second user;
• said encrypted video conference data being decrypted by using said decrypting key in the case where said second user uses said video conference data;
• and
• said data being reencrypted in the case where said second user stores decrypted said video conference data, in the case where edited video conference data is stored, or in the case where said video conference data is transmitted to third user.

A video conference data management system for using video conference data encrypted and supplied from first user to second user, said system using a crypt key, user information, and video conference data management program:

• wherein said second user presents second user information to said first user;
• said first user supplies to said second user said video conference data encrypted with the first crypt key;
• said second user uses said video conference data management program to generate the second crypt key based on said first crypt key;
• said encrypted video conference data is decrypted by using said first crypt key in the case where said second user uses said encrypted video conference data;
• and
• said decrypted video conference data is reencrypted by using said second crypt key in the case where said second user stores, copies or transmits said decrypted video conference data.