INVENTIONS: Blinding Xerox's Eye

The Xerox Corp. has grown to wealth and prominence by making it relatively easy and inexpensive to copy almost anything. Yet for the past decade, researchers at the company's Webster, N.Y., laboratories have been trying to find a way to render documents invisible to the luminescent eye of a Xerox machine. That seemingly suicidal quest was prompted by a growing clamor from publishers of copyrighted material who are angry about unlawful pirating of their works—and by Government nervousness about dissidents leaking xerographic evidence of federal mischief to the public (read Jack Anderson).

Xerox now has finally come up with an...

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