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:
Aug. 30, 2011
Filed:
Jan. 12, 2004
Sen'ichi Onoda, Toyonaka, JP;
Kouji Miura, Matsubara, JP;
Katsumi Tokuda, Ikeda, JP;
Motoji Ohmori, Hirakata, JP;
Hiroki Murakami, Suita, JP;
Sen'ichi Onoda, Toyonaka, JP;
Kouji Miura, Matsubara, JP;
Katsumi Tokuda, Ikeda, JP;
Motoji Ohmori, Hirakata, JP;
Hiroki Murakami, Suita, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A content distribution system distributes a content key and content use conditions for controlling a content use in a client apparatus to the client apparatus, via a communication channel, from either a multicast distribution server or a unicast distribution server. A content distribution management server determines by which distribution method to send the content key and content use conditions of each content according to an attribute of the content (a compression format, a compression ratio, a content holder, and the like). An encrypted content distribution server distributes only encrypted content whose content key and content use conditions are to be distributed by the unicast, and the multicast distribution server distributes encrypted content whose content key and content use conditions are superimposed by the multicast.