Patent ID: 6950941

Claim:
A system for preventing an illegal copy of digital content, said system receiving and decrypting encrypted digital content and reproducing the digital content, comprising: a certificate authority for generating manufacturer key information and generating first key information for giving an authorization to supply said encrypted digital content; a portable terminal supplier supplying a portable terminal, said portable terminal supplier outputting a first registration request signal to said certificate authority and receiving the manufacturer key information generated by said certificate authority in accordance with the first registration request signal, said portable terminal supplier imbedding the manufacturer key information in said portable terminal; a content supplier transmitting a second registration request signal to the certificate authority, said certificate authority and said content supplier sharing a first secret channel, said content supplier receiving and storing said first key information from the certificate authority through said first secret channel for supplying said encrypted digital content, said content supplier generating and outputting second key information for giving an authorization to receive and reproduce said encrypted digital content; a personal computer outputting a third registration request signal to the content supplier for obtaining said second key information, said personal computer having public key information of said certificate authority, said personal computer and said content supplier sharing a second secret channel, said personal computer verifying said first key information inputted from the content supplier by using said public key information of said certificate authority and receiving the second key information through said second secret channel, said personal computer receiving said encrypted digital content through said second secret channel; and said portable terminal manufactured by said portable terminal supplier for reproducing said digital content, said portable terminal transferring the imbedded manufacturer key information to said content supplier through said personal computer to be verified by said content supplier, said portable terminal and said personal computer sharing a third secret channel for transferring said encrypted digital content between said portable terminal and said personal computer.