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. 17, 2012
Filed:
Aug. 24, 2006
Takehiko Koyasu, Tokyo, JP;
Atsushi Kohno, Tokyo, JP;
Kimihiko Izaki, Tokyo, JP;
Nori Matsuda, Tokyo, JP;
Tatsuya Tsurukawa, Tokyo, JP;
Takehiko Koyasu, Tokyo, JP;
Atsushi Kohno, Tokyo, JP;
Kimihiko Izaki, Tokyo, JP;
Nori Matsuda, Tokyo, JP;
Tatsuya Tsurukawa, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A terminal writes first encrypted data in which a communication key and an owner ID are encrypted by using a public key into a second recording medium, and this medium is mounted to a communication apparatus so that the first encrypted data are transmitted to a server. The server sends second encrypted data which it acquires by encrypting a content decryption key by using the communication key which the server acquires by decrypting the received first encrypted data by using a secret key to the communication apparatus, and causes the communication apparatus to record them into the second recording medium. The terminal decrypts a content stored in a first recording medium by using the content decryption key which it acquires by decrypting the second encrypted data read from the second recording medium by using the communication key.