Patent ID: 7036019
Filing Date: 2006-04-25
Classification: G06F,G06Q,G11B,H04H,H04L,H04N

Abstract:
1. A digital data management method, comprising the steps of: encrypting digital data to produce encrypted digital data supplied to a user, using a utilization permit key pre-defined to permit at least one of displaying, editing, storing, copying, and transferring of said digital data; decrypting said encrypted digital data to decrypted digital data by using a display permit key, which is utilization permit key permitting displaying of said digital data, and displaying said decrypted digital data; decrypting said encrypted digital data to decrypted digital data by using a display permit key, which is said utilization permit key permitting displaying of said digital data, and displaying said decrypted digital data; decrypting said encrypted digital data to decrypted digital data by using an edit permit key, which is said utilization permit key permitting editing of said digital data, and editing said decrypted digital data; decrypting said encrypted digital data to decrypted digital data by using a storage permit key, which is said utilization permit key permitting storing of said digital data, encrypting again said decrypted digital data to encrypted digital data by using said storage permit key, and storing said encrypted digital data; decrypting said encrypted digital data to decrypted digital data by using a copy permit key, which is said utilization permit key permitting copying of said digital data, encrypting again said decrypted digital data to encrypted digital data by using said copy permit key, and copying said encrypted digital data; and decrypting said encrypted digital data to decrypted digital data by using a transfer permit key, which is said utilization permit key permitting transferring of said digital data, encrypting again said decrypted digital data to encrypted digital data by using said transfer permit key, and transferring said encrypted digital data.