Two data units are selected from main information, such as MIDI data, into which additional information is to be incorporated, to calculate a difference between respective values of the two data units. A particular data segment to be incorporated into one of the MIDI data units is selected from a group...http://www.google.com.tw/patents/US7849319?utm_source=gb-gplus-share專利 US7849319 - Method and device for incorporating additional information into main information through electronic watermarking technique
