An information recording apparatus, an information recording system, a program, and a recording medium are disclosed, by which contents are legally recorded to another information recording medium. Copy-once contents stored in a first optical disk are written to the second optical disk. After this writing is completed, a laser light having power equal to recording power is irradiated to the first optical disk so that reproduction of the copy-once contents in the first optical disk is made impossible. In this way, the copy-once contents stored in the first optical disk are erased, and the contents are moved to the second optical disk without jeopardizing the “copy-once” attribute of the contents. That is, the contents can be legally moved to another information recording medium.