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:
Jan. 18, 2011
Filed:
Dec. 06, 2004
Naohisa Kitazato, Tokyo, JP;
Yoshiharu Dewa, Tokyo, JP;
Yasushi Katayama, Tokyo, JP;
Tatsuya Shimoji, Osaka, JP;
Hideki Kagemoto, Nara, JP;
Katsumi Tokuda, Osaka, JP;
Hiroki Murakami, Osaka, JP;
Naohisa Kitazato, Tokyo, JP;
Yoshiharu Dewa, Tokyo, JP;
Yasushi Katayama, Tokyo, JP;
Tatsuya Shimoji, Osaka, JP;
Hideki Kagemoto, Nara, JP;
Katsumi Tokuda, Osaka, JP;
Hiroki Murakami, Osaka, JP;
Sony Corporation, Tokyo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a content delivery system including a server and content processing apparatus connected to each other across a network, a content delivered by the system is encrypted with a content key Kc, and supplied along with a sublicense encrypted with a work key Kw to a DTV. The sublicense includes a second use condition under which a content is used and a content key Kc for decrypting an encrypted content. The work key Kw for decrypting an encrypted content is included in a main license. The main license is supplied to the DTV separately from the content. The main license includes, in addition to the work key Kw, a first use condition under which a content under a subscription contract is used.