This book covers the necessary concepts of compressed domain watermarking. It concentrates on H.264 watermarking which is the latest video coding standard. The book presents a solution for the de-synchronization problem on watermark detection. The book present also a method for balancing, and controlling, the resulted bit rate after watermark embedding process. The book addresses the real time problem of watermark embedding and detection. The effects of watermark attacks on the watermarking process are discussed. The book presents the concept of user-controlled watermark.