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:
Apr. 10, 2007
Filed:
Aug. 29, 2000
Masayuki Hatanaka, Kawasaki, JP;
Jun Kamada, Kawasaki, JP;
Takahisa Hatakeyama, Kawasaki, JP;
Takayuki Hasebe, Kawasaki, JP;
Seigou Kotani, Kawasaki, JP;
Shigeki Furuta, Kawasaki, JP;
Takeaki Anazawa, Tokyo, JP;
Toshiaki Hioki, Ogaki, JP;
Miwa Kanamori, Ogaki, JP;
Yoshihiro Hori, Gifu, JP;
Masayuki Hatanaka, Kawasaki, JP;
Jun Kamada, Kawasaki, JP;
Takahisa Hatakeyama, Kawasaki, JP;
Takayuki Hasebe, Kawasaki, JP;
Seigou Kotani, Kawasaki, JP;
Shigeki Furuta, Kawasaki, JP;
Takeaki Anazawa, Tokyo, JP;
Toshiaki Hioki, Ogaki, JP;
Miwa Kanamori, Ogaki, JP;
Yoshihiro Hori, Gifu, JP;
Fujitsu Limited, Kawasaki, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A cellular phone has distributed encrypted content data and an encrypted content key stored in a memory. The encrypted content key data read out from the memory is decrypted by a decryption processing unit using key data Kp stored in a Kp hold unit, and then applied to a audio reproduction module. A decryption processing unit decrypts encrypted content data read out from the memory using a content key Kc extracted by the decryption processing unit to reproduce content data Dc.