Today, music distribution of compressed audio material, e.g., over the Internet, is an increasingly important technology. However, controlling use and further distribution of the delivered works are usually not possible. Within this context, watermarking can provide a useful mechanism to track illicit copies or to attach property rights information to the multimedia content. This paper discusses directly embedding robust watermarks into MPEG-2 AAC bit streams so that the watermark can be detected in the decompressed audio data.
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