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:
Jun. 30, 2009
Filed:
Jun. 17, 2004
Masaya Yamamoto, Arcadia, CA (US);
Motoji Ohmori, Hirakata, JP;
Masami Yamamichi, Legal Representative, Ota, JP;
Satomi Yamamichi, Legal Representative, Ota, JP;
Keiko Yamamichi, Legal Representative, Maebashi, JP;
Kazuhisa Watanabe, Yokohama, JP;
Atsushi Saso, Yokohama, JP;
Naoaki Yamamoto, Tokyo, JP;
Masaya Yamamoto, Arcadia, CA (US);
Motoji Ohmori, Hirakata, JP;
Masami Yamamichi, legal representative, Ota, JP;
Satomi Yamamichi, legal representative, Ota, JP;
Keiko Yamamichi, legal representative, Maebashi, JP;
Kazuhisa Watanabe, Yokohama, JP;
Atsushi Saso, Yokohama, JP;
Naoaki Yamamoto, Tokyo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A content playback apparatus prevents related content recorded on separate media that make up a virtual package from being played separately, thereby restricting playback of the content to only when the virtual package is assembled as intended by the creator, and protecting copyright of the content. A key obtaining unit obtains a second key, with use of key management information recorded on a recording medium on which related content relating to the encrypted content is also recorded. An information obtaining unit obtains the encrypted content and key generation information that relates to generation of the first key, from a source other than the recording medium. A key generation unit generates the first key with use of the second key and the obtained key generation information. A decryption unit decrypts the encrypted content with use of the first key.