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Data position measurement

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Data Position Measurement (DPM) is a copy protection method that controls the exact position of data on a CD. Stamped CDs are perfect clones and have the data always at the same position, whereas writable media differ from each other.

DPM detects these little physical differences to efficiently protect against duplicates. To circumvent it, a combination of a CD image and virtual drive can be used. CD burning software in a special read mode (DPM mode), tracks the exact locations of all data on the original disc and uses it to create an image in the new Extended Media Descriptor Format (XMG).

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