Jump to content

Data position measurement

From Wikipedia, the free encyclopedia
This is an old revision of this page, as edited by Ruud Koot (talk | contribs) at 14:57, 29 June 2009 (lk). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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. SecuROM 4 and later uses this protection method.[citation needed]

DPM can be circumvented by using suitable CD burning software (Alcohol 120% was the pioneer in this field) and a compatible CD burner: the disk must first be read with the DPM option enabled, and the copy must then be burned with Recordable Media Physical Signature (RMPS) data attached to the image; Alcohol 120% uses the media descriptor image format (.mds) to do so.

Nintendo optical discs have several "pinhole" marks, and then they store the exact position of these marks in the Burst Cutting Area.[1]

References

  1. ^ Anatomy of an Optical Medium Authentication by tmbinc


Stub icon

This computing article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Data_position_measurement&oldid=299320159"