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We consider a public multi-user information embedding (watermarking) systemin which two messages (watermarks) are independently embedded into twocorrelated covertexts and are transmitted through a multiple-access attackchannel. The tradeoff between the achievable embedding rates and the averagedistortions for the two embedders is studied. For given distortion levels,inner and outer bounds for the embedding capacity region are obtained insingle-letter form. Tighter bounds are also given for independent covertexts.

Inner and Outer Bounds for the Public Information Embedding Capacity Region Under Multiple Access Attacks