California Code, Business and Professions Code - BPC § 21800

(a) Every person who manufactures an optical disc for commercial purposes shall permanently mark each manufactured optical disc with an identification mark that identifies the name of the manufacturer and the state in which the optical disc was manufactured or, alternatively, a unique identifying code that will allow law enforcement personnel to determine the name of the manufacturer and the state in which the optical disc was manufactured.

(b) The identification mark required by this section shall be affixed by molding, diestamping, etching, or other permanent method in a manner in which the identification mark is clearly visible without the aid of magnification or special devices to read the mark.