The last ten years have seen rapidly growing in the field of digital watermarks. Meanwhile ,a large numberof attacks appears as fast as new algorithms are proposed,which emphasizes the limits and weaknesses of those algo-rithms. The tools ,methodologies and benchmarking of assessing the current algorithms are almost non-existent. Thispaper reviews a number of applications of digital watermarking and their properties ,describes and classifies a numberof attacks on digital watermarks,and analyzes the Stirmark ,Checkmark,Optimark benchmarking systems. At end,wegive some comment on the watermarking research.
