Patent ID: 6343283
Filing Date: 2002-01-29
Classification: G06F,G11B,H04L,H04N

Abstract:
A data copyright management method comprising:adding an unencrypted copyright label to copyrighted data and encrypting the copyrighted data using a first crypt key included in a first use permit key to produce encrypted copyrighted data; receiving the encrypted copyrighted data by a user from a database; requesting a key control center by the user to distribute the first use permit key to the user; distributing the first use permit key by the key control center to the user; decrypting the encrypted copyrighted data by the user to decrypted copyrighted data using the first crypt key and utilizing the decrypted copyrighted data using the first use permit key; requesting the key control center by the user to distribute a second use permit key which includes a second crypt key; distributing the second use permit key by the key control center to the user; editing the decrypted copyrighted data by the user using the second use permit key; encrypting edited decrypted copyrighted data using the second crypt key before storing the edited copyrighted data.