Charles Geschke, the co-founder of the software company Adobe who helped develop the Portable Document Format (PDF), has died at the age of 81.
Geschke set up Adobe in 1982 with fellow mate John Warnock, giving the world the ubiquitous PDF software, among many other audio-visual innovations.
He made headlines 10 years later when he was kidnapped at gunpoint and held for ransom before being released unhurt after a four-day ordeal.
Geschke died in California on Friday (16).
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