Contents sale system

Details Contents sale system Contents sale system

2005-05-03

2005-05-03

Trammell, James P. (Department: 3621)

Data processing: financial, business practice, management, or co

Business processing using cryptography

Usage protection of distributed data files

C705S050000, C705S051000, C705S052000, C705S053000, C705S054000, C705S055000, C705S056000, C705S058000, C705S059000, C705S060000, C705S075000, C705S024000, C705S039000, C705S041000, C235S380000, C235S375000, C235S379000, C380S029000, C380S281000, C713S185000, C713S193000, C713S152000

Reexamination Certificate

active

06889208

ABSTRACT:
In a contents sale system, original contents data are encrypted into encryption-resultant contents data in response to original playback key data. The original playback key data are encrypted into first encryption-resultant playback key data. The first encryption-resultant playback key data are encrypted into second encryption-resultant playback key data in response to an ID of a sale destination terminal apparatus. The encryption-resultant contents data and the second encryption-resultant playback key data are transmitted to the sale destination terminal apparatus. The sale destination terminal apparatus is enabled to decrypt the second encryption-resultant playback key data into the first encryption-resultant playback key data in response to the ID of the sale destination terminal apparatus. The sale destination terminal apparatus is enabled to decrypt the first encryption-resultant playback key data into the original playback key data. The sale destination terminal apparatus is enabled to decrypt the encryption-resultant contents data into the original contents data in response to the original playback key data.

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