fingerprint is akin to the serial number of
fingerprint is akin to the serial number of the copy. If a clear copy is found, the fingerprint identifies the copy that was compromised. Originally, a watermark was a faint imprint from the mould used to make high quality paper. We are all familiar with the use of watermarks in bank notes. In this application, the watermark is part of a number of measures used to indicate that the note is genuine rather than a counterfeit, to authenticate the note. A watermark can be highly visible, like an embossed logo. This often is used for preview copies of still images or video, where its role is partly to brand the content. Something subtler is needed for the full-resolution content, just like the watermark on a piece of paper or bill. An invisible identifier can be hidden in the video files, using the techniques of steganography (from the Greek, meaning hidden writing). The identifier can be extracted or detected by a software agent. Watermarking does not have to be a visual; there are schemes that embed a 278 The Technology of Video and Audio Streaming digital video file Shared key content server media player encrypt decrypt Public integer numbers: P, G E = GX mod P Public key F = GY mod P Public key K = FX mod P Shared key K = EY mod P Shared key Y E F K K Key exchange Private key X Private key clear or plaintext clear or plaintext encrypted or ciphertext Figure 14.8 The Diffie Hellman key agreement.
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