Copyrighted digital data management method, contents...

Details Copyrighted digital data management method, contents... Copyrighted digital data management method, contents...

2005-05-03

2005-05-03

Smithers, Matthew (Department: 2137)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C380S233000

Reexamination Certificate

active

06889327

ABSTRACT:
After a user terminal executes a data usage accounting procedure for a contents provider, enciphered copyrighted digital data generated by enciphering chargeable copyrighted digital data using encryption key data, digital sample preview data generated from an outline of the copyrighted digital data at a non-chargeable level without enciphering, decryption key data for deciphering the enciphered copyrighted digital data, and additional data required for accounting are transmitted from the contents provider to the user terminal over a network.

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