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Leonardo da Vinci's famous drawing Vitruvian Man comes from a description by the ancient Roman architect Marcus Vitruvius Pollio, who wrote the only major work on architecture or engineering to survive from classical antiquity. Vitruvius remains a mystery. We know he was not wellborn and that he was exceptionally well educated. Yet, he held the position of military engineer under Julius Caesar and took part in many of Caesar's campaigns. He ...

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The mid-1990ssaw an exciting convergenceof a number of dieren t information protection technologies, whose theme was the hiding (as opposed to encryption) of information. Copyright marking schemes are about hiding either copyright notices or individual serial numbers imperceptibly in digital audio and video, as a component in intellectual property protection systems, anonymous c- munication is another area of rapid growth, with people designin...