INFORMATION PROCESSING METHOD AND RECORDED MEDIUM

摘要

Digital audio ID information (3) having a meaning of ID information is embedded as invisible electronic watermark information in a sampled value region of digital original image information (1) or in a frequency region where the digital original information is subjected to frequency conversion, and the embedded digital audio ID information is made separable from the sampled value region or the frequency region by an information processing device (41), thereby realizing a function of inhibiting illegal copy of digital image information. Since digital audio ID information is adopted as electronic watermark information having a meaning of ID information, the information is recognized as a meaning even if, e.g., 50% of the information is lost. Further the watermark strength against disturbance is high. The strength against disturbance is desirably and simply selected according to a request by readily changing the audio parameters, such as the number of quantized bits and sampling frequency. ID information can be relatively easily recognized by using an electronic watermark even by a low-cost system.