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The Color to Gray and Back transformation watermarking with a secrete key isconsidered. Color is embedded into the bit planes of the luminosity componentof the YUV color space with the help of a block algorithm that allows using notonly the least significant bits. An application of the problem of distributingcolor digital images from a data base among legitimate users is discussed. Theproposed protocol can protect original images from unauthorized copying.

Color to Gray and Back transformation for distributing color digital images