Embodiments of the present invention provide a method for producing a summary of a digital file on one or more computers. The method includes segmenting the digital file into a plurality of segments, clustering said segments into a plurality of clusters and selecting a cluster from said plurality of clusters wherein said selected cluster includes segments representative of said digital file. Upon selection of a cluster a segment of the cluster is provided as a summary of said digital file.

 
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> System for spectral multiplexing of source image to provide a composite image with noise encoding to increase image confusion in the composite image, for rendering the composite image, and for spectral demultiplexing of the composite image

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