Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2005-03-14
2010-10-19
Hewitt, II, Calvin L (Department: 3685)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S051000, C705S057000, C380S201000, C380S202000, C084S645000
Reexamination Certificate
active
07818258
ABSTRACT:
In an electronic musical apparatus, a media ID (MD1, MD2, MD3, MD4, MD5) is associated with each recording media of a memory card8, hard disk device10, flash memory ROM11, CD-ROM12and internet15. Each media ID is encrypted to be recorded on a different position in a ROM2. 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 RAM3. 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 RAM3is deleted. This makes cryptanalysis hard to thereby enhance a protection level of a music content in an electronic musical apparatus.
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Hewitt II Calvin L
Kim Steven
Rossi Kimms & McDowell LLP
Yamaha Corporation
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