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:
Feb. 05, 2008
Filed:
Aug. 20, 2002
Yasuhiro Yamanaka, Chiba, JP;
Kazunori Yoshitomi, Kanagawa, JP;
Fumiaki Hisamatsu, Kanagawa, JP;
Kenji Yoshino, Tokyo, JP;
Shinichi Ueno, Tokyo, JP;
Yasuhiro Yamanaka, Chiba, JP;
Kazunori Yoshitomi, Kanagawa, JP;
Fumiaki Hisamatsu, Kanagawa, JP;
Kenji Yoshino, Tokyo, JP;
Shinichi Ueno, Tokyo, JP;
Sony Corporation, , JP;
Abstract
An authoring system authors content data for distribution through an information terminal by encryption for copyright protection. The system includes an authoring device and an authoring key generator. The generator generates a content identifier uniquely allocated to each of the content data, an authoring key enabling key uniquely allocated to the authoring device, and an authoring key obtained by encrypting a content key for encrypting the content data and a second content key using the CID and the CEK. The second content key is formed by encrypting the content key using a root key. The authoring device has a unit which decrypts the content key and the second content key using the CID and the CEK, and a unit which encrypts the content data using the decrypted content key to generate authored encrypted content data.