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. 01, 2008
Filed:
Mar. 25, 2002
Akio Fukushima, Yokohama, JP;
Hiroyuki Kimura, Hiratsuka, JP;
Akio Fukushima, Yokohama, JP;
Hiroyuki Kimura, Hiratsuka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
It is an object of the present invention to more strongly protect data to be distributed from being illegally plagiarized, and further, to add an electronic watermark function necessary to protect the copyright to all reproduction means apparatuses. In order to achieve the above-described objects, according to the present invention, data targeted for protection is encrypted, and an encryption key required for decrypting this encrypted data and reproduction control data for protecting the copyright are embedded in encrypted data through the use of the electronic watermark. Thus, when reproducing the data, the electronic watermark is detected, and the encryption key required for decrypting the cryptogram and the reproduction control data for protecting the copyright are restored. Through the use of the restored encryption key, the cryptogram is decrypted. Thus, through the use of the reproduction control data restored, the reproduction of the data targeted for protection is controlled.