Patent ID: 6463536
Filing Date: 2002-10-08
Classification: G06F,H04L,H04N

Abstract:
A data copyright management system used for producing new data by editing a plurality of encrypted data, whereina 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 saidâ€²second user with the crypt key for use when the editor is confirmed to be the first user.