Content sales period verifying system and content decryption...

Details Content sales period verifying system and content decryption... Content sales period verifying system and content decryption...

2006-03-21

2006-03-21

Eddy, Elisca Pierre (Department: 3621)

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

Business processing using cryptography

Usage protection of distributed data files

C705S052000

Reexamination Certificate

active

07016878

ABSTRACT:
A CD-ROM is recorded with a CD-ROM effective period and an effective period of a content stored in the CD-ROM. A CD-ROM effective period judging section of a personal computer reads the effective periods, compares these periods with a machine date generated by a machine date generating section and enables a purchase slip transmitting section to transmit a purchase slip only when the machine data falls within the effective periods. A CD-ROM effective period judging section of a center compares the present date with the CD-ROM effective period and the content effective period registered on a goods master, reads the key from the goods master and transmits the key to the personal computer only when both of a CD-ROM number and a content ID written onto the received purchase slip fall within the effective periods.

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