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:
May. 24, 2005
Filed:
Dec. 06, 2000
Yoshihiro Hori, Gifu, JP;
Toshiaki Hioki, Ogaki, JP;
Miwa Kanamori, Ogaki, JP;
Takatoshi Yoshikawa, Ogaki, JP;
Hiroshi Takemura, Aichi, JP;
Takayuki Hasebe, 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;
Takayuki Hasebe, Kawasaki, JP;
Takahisa Hatakeyama, Kawasaki, JP;
Tadaaki Tonegawa, Kodaira, JP;
Takeaki Anazawa, Tokyo, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A cellular phone () stores encrypted content data and encrypted license key distributed thereto in a memory card (). The cellular phone () and the memory card () collectively perform a part of mutual authentication processing upon power-on. The encrypted license key (Kc) read from the memory card () is decrypted by a first decryption processing portion () with a session key (Ks), and is further decrypted by a second decryption processing portion () with a system symmetric key (Kcom) for extraction. A third encryption processing portion () decrypts the encrypted content data read from memory card () with the license key (Kc) to reproduce content data (Data).