The new watermarking scheme in this paper solves the problem of digital copyright protection in computer network society. The proposed scheme coalesces both the technique of vector quantization (VQ) and the technique of principal component analysis (PCA). Therefore, it can effectively embed and extract watermarks. The proposed scheme is an invisible, robust, secure, multiple and blind watermarking technique. After various attacks such as JPEG lossy compression, blurring, cropping, rotating, and sharpening, the proposed scheme still provides robust watermarks. (pp. 391-396)