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. 15, 2007
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 license server () includes a CRL database () holding a revocation list recording therein classes predetermined corresponding respectively to a memory device, such as a memory card, and a content reproduction circuit, such as a cellular phone, that are subjected to revocation of distributing, reproducing and transferring content data. A distribution control unit () suspends an operation distributing content data if the distribution is addressed to a class listed on the revocation list. The revocation list is also held in the memory card and distribution control unit () in distributing content also transmits information for updating the revocation list in the memory card.