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. 26, 2009
Filed:
Aug. 28, 2003
Yuusaku Ohta, Neyagawa, JP;
Hiroki Yamauchi, Ibaraki, JP;
Masaya Miyazaki, Ikeda, JP;
Natsume Matsuzaki, Mino, JP;
Toshihisa Abe, Izumisano, JP;
Yuusaku Ohta, Neyagawa, JP;
Hiroki Yamauchi, Ibaraki, JP;
Masaya Miyazaki, Ikeda, JP;
Natsume Matsuzaki, Mino, JP;
Toshihisa Abe, Izumisano, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A key delivery apparatus that prevents improper use of contents, and manages a decryption key for decrypting encrypted content and a suppliable number showing how many times the decryption key is suppliable, with respect to one or more terminal apparatuses connected to a network. The key delivery apparatus receives a supply request for the decryption key from a terminal apparatus, and if the terminal apparatus is a legitimate supply target, judges whether the terminal apparatus is a first-type that manages a content-usage period or a second-type that does not manage the content-usage period, and if the suppliable number has a remaining number, supplies to the terminal apparatus, the decryption key and a key-usage period of the decryption key when judged that the terminal apparatus is the first-type and the decryption key when judged that the terminal apparatus is the second-type.