To provide an optical recording medium recorder that applies copy protection to an optical recording medium and records main data such as software and music information on the optical recording medium without increasing its cost.

This optical recording medium recorder for performing recording on an optical recording medium provided with a data recording area and a key information recording area and having a configuration in which the key information recording area is located at an area where an optical head of a player does not scan in a normal reading operation for main data, the data recording area and the key information recording area are located at the same signal surface, and recording is performed on the data recording area and the key information recording area at recording density different from each other, is provided with a means for enciphering an inputted digital signal on the basis of key information, a means for recording the enciphered digital signal as main data on the data recording area, and a means for recording the key information on the key information recording area.