In this paper, we propose a real-time video watermarking chip and system which is hardware based watermark embedding system of SD/HD (standard definition/high definition) video with STRATIX2 FPGA device from ALTERA. There was little visual artifact due to watermarking in subjective quality evaluation between the original video and the watermarked one. Embedded watermark was all extracted after a robustness test called natural video attacks such as A/D (analog/digital) conversion and MPEG compression. Our implemented watermarking hardware system can be useful in movie production and broadcasting companies that requires real-time based copyright protection system.