The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2008
Filed:
Dec. 01, 2000
Yoshihiro Hori, Gifu, JP;
Toshiaki Hioki, Ogaki, JP;
Miwa Kanamori, Ogaki, JP;
Takatoshi Yoshikawa, Ogaki, JP;
Hiroshi Takemura, Aichi, JP;
Masataka Takahashi, Ishikawa, JP;
Takayuki Hasebe, Kawasaki, JP;
Shigeki Furuta, Kawasaki, JP;
Takahisa Hatakeyama, Kawasaki, JP;
Tadaaki Tonegawa, Kodaira, JP;
Takeaki Anazawa, Tokyo, JP;
Yoshihiro Hori, Gifu, JP;
Toshiaki Hioki, Ogaki, JP;
Miwa Kanamori, Ogaki, JP;
Takatoshi Yoshikawa, Ogaki, JP;
Hiroshi Takemura, Aichi, JP;
Masataka Takahashi, Ishikawa, JP;
Takayuki Hasebe, Kawasaki, JP;
Shigeki Furuta, Kawasaki, JP;
Takahisa Hatakeyama, Kawasaki, JP;
Tadaaki Tonegawa, Kodaira, JP;
Takeaki Anazawa, Tokyo, JP;
Abstract
A memory card () conducts an authentication process with a server based on data stored in an authentication data hold unit (). The memory card () extracts a first session key (Ks) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS). The memory card () generates a second session key (Ks) through a session key generation unit (), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks) and a key (KPm()) unique to the memory card () in an encrypted state with the first session key (Ks). The transaction ID and the second session key (Ks) stored in the log memory () are used in the redistribution process.