DLP is a technology that detects potential data breach incidents in timely manner and prevents them by monitoring data in-use (endpoints), in-motion (network traffic), and at-rest (data storage). It has been driven by regulatory compliances and intellectual property protection. This talk will introduce DLP models that describe the capabilities and scope that a DLP system should cover. A few system categories will be discussed accordingly with high-level system architecture. DLP is an interesting technology in that it provides advanced content inspection techniques. As such, a few content inspection techniques will be proposed and investigated in rigorous terms.