To provide an information processor, an information processing method and a program storage medium by which a copyright infringement action for the contents distributed to many and unspecified terminal devices via a network is suppressed efficiently.

Electronic watermark information S72a, S72b, S80a, S80b, S81a and S81b, which are respectively included in each band and the boundary band field of each band of the contents divided into plural bands, are extracted. Then, the residual conditions of the information S72a, S72b, S80a, S80b, S81a and S81b extracted from the plural bands and the boundary bands of each band are compared. Then, advisability of the recording of the contents to a prescribed recording medium is judged, based on the comparison result. Thus, the copyright in fringement action of the contents distributed to many and unspecified terminal devices 71 to 7n via a network 1 is suppressed effectively.