Leakage detection is the technique for handling secure data delivery. A data distributor has given sensitive data to a set of trusted agents (third parties). Some of the data are leaked and found in an unauthorized place (e.g., on the web or somebody’s laptop). The distributor must assess how the data is leaked and who leaked the data. Data allocation strategies (across the agents) are proposed to improve the probability of identifying leakages. To improve the chances of detecting leaked data, “Realistic but fake” records was injected to the original data.