Information processing device, access device, recording medium, information processing method, and information processing program

An information recording medium comprising:

• a recording layer for reproducing information therefrom by laser light irradiation,
• the recording layer including a characteristic information region where characteristic information indicating a characteristic of the information recording medium is recorded, in which
• when the information recording medium has a first characteristic such that a first reflectance of light reflected by a recorded region of the information recording medium is greater than a second reflectance of light reflected by an unrecorded region of the information recording medium, the characteristic information indicating the first characteristic is recorded in the characteristic information region, and
• when the information recording medium has a second characteristic such that the first reflectance is less than the second reflectance, the characteristic information indicating the second characteristic is recorded in the characteristic information region.