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Digital watermarking is defined as a process of embedding data (watermark) into an image to protect the owner's right to that data. Along with the explosive growth of the Internet, digital media is very easily accessible by unauthorized persons. This gives birth to the relatively new research field of "Digital watermarking" to protect ones intellectual property rights. A multiple watermarking algorithm based on the CDMA spread spectrum technique is presented. Multiple copyright Identifiers are convolutional encoded and block interleaved and the orthogonal gold sequences are used to spread spectrum of the copyright messages. The CDMA encoded copyright messages are embedded into the original image with the help of discrete wavelet transformation.
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