Data position measurement (DPM) is a copy protection mechanism that operates by measuring the physical location of data on an optical disc. Stamped CDs are perfect clones and always have the data at the expected location, while a burned copy would exhibit physical differences. DPM detects these differences to identify user-made copies. DPM was first used publicly in SecuROM 4.7.
Famous quotes containing the words data, position and/or measurement:
“Mental health data from the 1950’s on middle-aged women showed them to be a particularly distressed group, vulnerable to depression and feelings of uselessness. This isn’t surprising. If society tells you that your main role is to be attractive to men and you are getting crow’s feet, and to be a mother to children and yours are leaving home, no wonder you are distressed.”
—Grace Baruch (20th century)
“They aroused me to a determination to understand more fully the position of women, and the character of those men who talk so much of the need of our being “protected”Mremoving from us, meanwhile, what are often the very weapons of our defence [sic], occupations, and proper and encouraging remuneration.”
—Harriot K. Hunt (1805–1875)
“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (1896–1970)