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. 28, 2009
Filed:
Oct. 03, 2002
Yusei Nishimoto, Tokyo, JP;
Tatsuya Kurioka, Tokyo, JP;
Toshihiro Uehara, Tokyo, JP;
Seiichi Namba, Tokyo, JP;
Yusei Nishimoto, Tokyo, JP;
Tatsuya Kurioka, Tokyo, JP;
Toshihiro Uehara, Tokyo, JP;
Seiichi Namba, Tokyo, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Abstract
A content transmission method, a content reception method, an apparatus and a computer program using same, that improve the efficiency of descrambling a scrambled content, make the management of cryptography keys for descrambling easy, and protect the copyright of contents, are provided. A content transmission apparatusthat encrypts and transmits contents and a content reception apparatusthat receives the encrypted contents are provided. The content transmission apparatusincludes a content scrambling unitthat encrypts contents using a scrambling key Ks, a content key , a work key Kw, a master key Km, and a multiplexing unitthat transmits multiplexed contents. The content reception apparatusincludes a separating unitthat receives and separates the multiplexed encrypted content, and a content descrambling unitthat obtains the contents by descrambling encrypted information separated by the separating unit