Overlapping area represents the amount of risk that can be diversified away by holding Verint Systems Inc and Digimarc Corp. in the same portfolio assuming nothing else is changed. The correlation between historical prices or returns on Digimarc and Verint Systems is a relative statistical measure of the degree to which these equity instruments tend to move together. The correlation coefficient measures the extent to which returns on Verint Systems are associated (or correlated) with Digimarc. Values of the correlation coefficient range from -1 to +1, where. The correlation of zero (0) is possible when the price movement of Digimarc has no effect on the direction of Verint Systems i.e. Verint Systems and Digimarc go up and down completely randomly.