This paper proposed a removable visible watermark system for video sequences using dual watermarking technique, embedding both visible and invisible watermarks into the video sequence. The visible watermark is embedded into every frame of the video sequence in the Discrete Cosine Transform (DCT) domain, considering the Human Visual System (HVS) model. The invisible watermark is embedded into every intra-frame during the MPEG encoding, using the Quantization Index Modulation-Dither Modulation (QIM-DM) technique. In the proposed scheme, two user's keys are introduced to ensure that only authorized users can remove the visible watermark to obtain clear video sequence. The experimental results show the desirable performance of the proposed scheme, in which unauthorized users cannot remove the visible watermark. The process is carried out through a totally blind manner without any extra information.
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