A data distributor has given sensitive data to a set of supposedly trusted agents (third parties). Some of the data is leaked and found in an unauthorized place (e.g., on the web or somebody's laptop). The distributor must assess the likelihood that the leaked data came from one or more agents, as opposed to having been independently gathered by other means. The authors propose data allocation strategies (across the agents) that improve the probability of identifying leakages. These methods do not rely on alterations of the released data.