摘要：

A method (), an apparatus, a computer readable medium and use of said method for authenticating an audio-visual signal (), such as a digital image or video, are disclosed. A signature is derived from all image regions, including areas with flat or otherwise un-watermarkable content. By combining signature bits from all regions of the audio-visual signal and spreading the signature bits over the whole audio-visual signal or at least a large area of it, preferably by applying a spread spectrum watermarking technique (), the authenticity of flat regions is verified.

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