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:
Jul. 10, 2007
Filed:
May. 10, 1999
Yasushi Katsumata, Kanagawa, JP;
Masayuki Ohbayashi, Kanagawa, JP;
Takashi Nakatsuyama, Chiba, JP;
Han Min-jae, Tokyo, JP;
Yasushi Katsumata, Kanagawa, JP;
Masayuki Ohbayashi, Kanagawa, JP;
Takashi Nakatsuyama, Chiba, JP;
Han Min-Jae, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A contents database in which data of contents enciphered by a C key is stored and provided for a contents server, wherein the contents data enciphered by the C key are enciphered by an M key and sent to a user machine. In the user machine, the contents data enciphered by the C key are stored in a storage device. Upon reproduction, the contents data enciphered by the C key from the storage device are sent to an enciphering/decoding processing unit and decoded and charging is performed in accordance with the C key. A dynamic authenticating code which dynamically changes with the elapse of time is added to the C key.