FIELD: electronic devices. SUBSTANCE: electronic device that may be game device or reader of visually identified symbol information formed on compact-disk read-only memory device for protecting against counterfeit products or eliminating them has compact disk installation unit that holds compact disk with visually identified symbol information. It also has unit identifying specific information retrieved from unit information incorporating symbol information, and comparison unit that saves basic data corresponding to data subject to comparison. Comparison unit functions to compare specific information with data subject to comparison and to generate output signal of comparison result. EFFECT: reduced time for reading specific protection symbol; enhanced protection efficiency. 17 cl, 15 dwg
