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:
Dec. 20, 2011
Filed:
Jan. 16, 2009
Tetsuo Okamoto, Hamamatsu, JP;
Tetsuo Okamoto, Hamamatsu, JP;
Yamaha Corporation, , JP;
Abstract
In an electronic musical apparatus, a media ID (MD, MD, MD, MD, MD) is associated with each recording media of a memory card, hard disk device, flash memory ROM, CD-ROMand internet. Each media ID is encrypted to be recorded on a different position in a ROM. Upon reading a music content, the media ID of the corresponding recording media is decoded to decode the music content based upon the media ID and the secret key, and then, the resultant is temporarily stored in a RAM. Upon writing a music content, it is encrypted based upon the media ID corresponding to a recording media and the secret key, and the content in the RAMis deleted. This makes cryptanalysis hard to thereby enhance a protection level of a music content in an electronic musical apparatus.