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Data position measurement information


Data position measurement (DPM) is a CD and DVD 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 1996 by Link Data Security's CD-Cops. It was used in volume on Lademans Leksikon published by Egmont in November 1996.

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Data position measurement

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Data position measurement (DPM) is a CD and DVD copy protection mechanism that operates by measuring the physical location of data on an optical disc....

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Level of measurement

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Level of measurement or scale of measure is a classification that describes the nature of information within the values assigned to variables. Psychologist...

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Compact Disc and DVD copy protection

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perfect clones and have the data always at the same position, whereas writable media differ from each other. Data Position Measurement (DPM) detects these little...

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Measurement

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Measurement is the quantification of attributes of an object or event, which can be used to compare with other objects or events. In other words, measurement...

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DPM

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testing processes in Russian doping programme Data position measurement Digital Postmarks System Center Data Protection Manager, by Microsoft Direct part...

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SecuROM

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on Windows. The method of disc protection in later versions is data position measurement, which may be used in conjunction with online activation DRM....

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Data

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larger structures. Data may be used as variables in a computational process. Data may represent abstract ideas or concrete measurements. Data is commonly used...

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Inertial measurement unit

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Systems which utilize the raw IMU measurements to calculate attitude, angular rates, linear velocity and position relative to a global reference frame...

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Pressure measurement

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Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per...

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Phasor measurement unit

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A phasor measurement unit (PMU) is a device used to estimate the magnitude and phase angle of an electrical phasor quantity (such as voltage or current)...

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Measurement in quantum mechanics

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near-certain prediction of the result of a position measurement, but the result of a momentum measurement will be highly unpredictable, and vice versa...

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Measurement problem

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mechanics, the measurement problem is the problem of definite outcomes: quantum systems have superpositions but quantum measurements only give one definite...

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Geopositioning

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influence the measurement of distances and angles. A practical example of obtaining a position fix would be for a ship to take bearing measurements on three...

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Global Positioning System

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traveled between two position measurements drops below or near the random error of position measurement. GPS units can use measurements of the Doppler shift...

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Compositional data

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simplex. Measurements involving probabilities, proportions, percentages, and ppm can all be thought of as compositional data. Compositional data in three...

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Data validation and reconciliation

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mathematical methods in order to automatically ensure data validation and reconciliation by correcting measurements in industrial processes. The use of PDR allows...

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Surveying

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speed of measurement. Major advances include tilt compensators, data recorders and on-board calculation programs. The first satellite positioning system...

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Likert scale

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categories. Not every set of Likert scaled items can be used for Rasch measurement. The data has to be thoroughly checked to fulfill the strict formal axioms...

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Quantitative research

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and methods for measurement Experimental control and manipulation of variables Collection of empirical data Modeling and analysis of data Quantitative research...

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Tree measurement

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tree: tree height measurement, tree girth measurement, and tree crown measurement. Foresters also perform tree volume measurements. A detailed guideline...

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List of unusual units of measurement

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An unusual unit of measurement is a unit of measurement that does not form part of a coherent system of measurement, especially because its exact quantity...

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Crankshaft position sensor

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inject the fuel. It is also commonly used as the primary source for the measurement of engine speed in revolutions per minute. Common mounting locations...

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Vertical position

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Vertical position or vertical location is a position along a vertical direction (the plumb line direction) above or below a given vertical datum (a reference...

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Telemetry

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Telemetry is the in situ collection of measurements or other data at remote points and their automatic transmission to receiving equipment (telecommunication)...

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Data assimilation

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due to the quality of the instrument and how accurately the position of the measurement is known. These errors can cause instabilities in the models...

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