To develop a security multipurpose image watermarking system，we use the 3D unified chaotic system sequences [WTHX]Y[WTBZ] and [WTHX]Z[WTBZ] to generate embedding coefficients of visible watermarks

and embed the visible watermarks in the image spatial domain to achieve the goal of copyright notification. Then we embed the first invisible watermarks in the image with embedded visible watermarks to obtain the aim of copyright protection. After removing the visible watermarks

the second invisible watermarks are embedded in the image to obtain the aim of unauthorized copy tracing. Two kinds of invisible watermarks embedding positions are selected randomly by unified chaotic system sequences [WTHX]X[WTBZ] and [WTHX]Y[WTBZ]

based on a novel dual parameters quantization technique. Both watermarks that can be blindly extracted are embedded in the lifting wavelet transform (LWT) domain of those selected bocks. Simulation results show that the visible watermarks can be removed entirely by authorized users and can hardly be removed by unauthorized users. The impact of the invisible watermarks on the image quality is slight

and the invisible watermarks are robust to common image processing operations.