Method with apparatus for determining the provenance of a data carrying disc

摘要

A method of determining the provenance of a data carrying disc comprises the steps of a) determining physical characteristics of selected data recorded on a first test disc whose provenance is to be determined and b) comparing the physical characteristics determined with the physical characteristics of the same data on a second data carrying disc produced from a known source to determine whether the test disc has been produced from the known source wherein the physical characteristics determined have arisen inherently out of the manufacturing process from which the first and second discs are produced.