Abstract: A method and apparatus for uniquely identifying a digital storage medium is described. In one example, at least one physical attribute of a recording surface is determined. For example, at least one position of the recording surface may be associated with at least one data unit stored on the digital storage medium. Identification indicia is formed from the at least one physical attribute. In another example, a digital recording source is associated with a digital storage medium that was replicated from the source. Identification indicia associated with the digital recording source is obtained by analyzing at least one physical attribute of a recording surface on the digital storage medium. The identification indicia is then compared with the at least one physical attribute to determine if the digital recording source was in fact used to replicate the digital storage medium.