US 6,983,369 B2
Authentication system, and contents-information sender and receiver
Takeo Ohishi, Yokohama (Japan)
Assigned to Victor Company of Japan, Ltd., Yokohama (Japan)
Filed on Apr. 18, 2001, as Appl. No. 9/836,325.
Claims priority of application No. 2000-133957 (JP), filed on May 02, 2000; and application No. 2001-103743 (JP), filed on Apr. 02, 2001.
Prior Publication US 2001/0039613 A1, Nov. 08, 2001
Int. Cl. H01L 9/00 (2006.01)
U.S. Cl. 713—175 32 Claims
OG exemplary drawing
 
1. A method of authentication, comprising the steps of:
a) sending first information from a contents-information receiver apparatus to a contents-information sender apparatus, the first information including a combination of certificate information representative of presence of a license granted to the contents-information receiver apparatus and identification information for identifying the contents-information receiver apparatus, the first information further including a signal of a signature for the combination of the certificate information and the identification information;
b) in the contents-information sender apparatus, determining whether the combination of the certificate information and the identification information in the first information sent by the step a) is correct or wrong in response to the signal of the signature in the first information;
c) in the contents-information sender apparatus, extracting the identification information from the first information sent by the step a) and storing the extracted identification information;
d) sending the identification information from the contents-information receiver apparatus to the contents-information sender apparatus at a time different from a time of the step a); and
e) in the contents-information sender apparatus, collating the identification information sent by the step d) with the identification information stored by the step c).