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:
Mar. 30, 2010
Filed:
Aug. 30, 2004
Manabu Sasamoto, Yokohama, JP;
Hiroo Okamoto, Yokohama, JP;
Toshifumi Takeuchi, Yokohama, JP;
Masaru Takahashi, Yokohama, JP;
Manabu Sasamoto, Yokohama, JP;
Hiroo Okamoto, Yokohama, JP;
Toshifumi Takeuchi, Yokohama, JP;
Masaru Takahashi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A digital signal recording apparatus is disclosed, which is capable of protecting the copyright of the analog input information encoded into a first digital signal in a recording medium. A second digital signal encrypted based on the key information and the input analog signal encrypted based on the key information are converted into a second digital signal and encrypted, and the resulting signal is selectively recorded in a recording medium. The digital signal recording apparatus further comprises a circuit for encrypting the digital signal converted from the input analog signal with a key obtained by a predetermined calculation of the key information according to a scheme similar to the second digital signal protection scheme through a digital interface, and a signal recording circuit for recording the key information and the encrypted digital signal in a recording medium.