Data copyright management system
First Claim
1. A data copyright management system used for producing new data by editing a plurality of encrypted data, wherein a first user obtains a plurality of encrypted data from a database and decrypts said data by using a crypt key supplied from said database;
- new data is produced by editing said data decrypted;
said first user supplies both a crypt key for each of said plurality of encrypted data and edition program with digital signature as a use permit key to a second user;
said second user who receives the edited and encrypted data request use of said data by presenting the edition program with digital signature to a copyright management center; and
said copyright management center identifies the first user as an editor with the digital signature, and provides said second user with the crypt key for use when the editor is confirmed to be the first user.
5 Assignments
0 Petitions
Accused Products
Abstract
A system is provided which manages the copyright of a plurality of data in a database. A data copyright management system is provided in which a primary user edits data which he or she obtains and supplies edited data to a secondary user. In a case where new data is produced by editing a plurality of encrypted data obtained from the database, and is encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edit program which is an editing process with a digital signature are used as a use permit key. When a user who receives the edited and encrypted data requests use of the data by presenting the digital signature to a copyright management center, the copyright management center identifies the editor by the digital signature, and provides the user requiring use of data with the crypt key for use only when the editor is identified to be the valid user of the edited data. The system comprises a database and a key control center, and uses a primary copyright label, a first use permit key including a first crypt key, a second use permit key, a third crypt key, and a copyright management program. The primary user uses primary copyrighted data encrypted by using the first crypt key and supplied, by decrypting it with the first use permit key obtained from the key control center. The data is encrypted again by using the first use permit key when it is stored. The primary user edits the primary copyrighted data by obtaining a second use permit key from the key control center for editing the primary copyrighted data. The data being edited is encrypted and stored by using the second use permit key. At the completion of the editing, the primary user receives the third crypt key for secondary copyright as
40 Citations
3 Claims
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1. A data copyright management system used for producing new data by editing a plurality of encrypted data, wherein
a first user obtains a plurality of encrypted data from a database and decrypts said data by using a crypt key supplied from said database; -
new data is produced by editing said data decrypted;
said first user supplies both a crypt key for each of said plurality of encrypted data and edition program with digital signature as a use permit key to a second user;
said second user who receives the edited and encrypted data request use of said data by presenting the edition program with digital signature to a copyright management center; and
said copyright management center identifies the first user as an editor with the digital signature, and provides said second user with the crypt key for use when the editor is confirmed to be the first user. - View Dependent Claims (3)
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2. A data copyright management system comprising a database and a key control center, and for managing copyrights when a primary user edits primary copyrighted data which is obtained, and supplies secondary copyrighted data obtained through editing to a secondary user, wherein
said primary copyrighted data is encrypted by using a first use permit key and then supplied to said primary user; -
said key control center distributes said use permit key to said primary user when said primary user wishing to use said primary copyrighted data requests distribution of said first use permit key to said key control center;
said primary user decrypts said primary copyrighted data for primary use by using said distributed first use permit key;
said primary user wishing to edit said primary copyrighted data is distributed with a second use permit key for editing said primary copyrighted data from said key control center, and edits said primary copyrighted data by using said distributed second use permit key, said copyrighted data during editing being encrypted and stored by using said second use permit key;
said primary user who completes editing is distributed from said key control center with a third use permit key for distributing the edited data, and supplies said edited data to a secondary user after encrypting said edited data by using said third use permit key; and
said secondary user wishing to use said secondary copyrighted data is distributed with said third use permit key from said key control center, and decrypts said secondary copyrighted data by using said distributed third use permit key for use.
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Specification