Patent ID: 7388144
Filing Date: 2008-06-17
Classification: G06T,G10H,G11B,H04N

Abstract:
1. A method of creating a watermark by embedding electronic signature data in main data and storing the main data and electronic signature data in a readable form, said method comprising: a supply step of supplying main data, wherein said main data is music performance data complying with MIDI standards and comprises a plurality of MIDI event data; a calculation step of performing a predetermined arithmetic operation using predetermined MIDI event data included in the main data supplied by said supply step; and a change step of changing, in accordance with a predetermined first algorithm and using electronic signature data, a result of the predetermined arithmetic operation performed by said calculation step and changing, in accordance with a predetermined second algorithm and using the changed result of the arithmetic operation, MIDI event data in the main data supplied by said supply step to create a watermark.