"Portable Document Format, designed in the early 1990s by Adobe
Systems, is slowly replacing PostScript as the preferred format for
saving and viewing generic documents. Early on, only Adobe supplied
programs that enabled users to view PDF files. But since the
format's specification is open, Adobe Reader (formerly 'Adobe
Acrobat Reader') is now only one among an increasing set of PDF
viewers. Here's a guide to the best alternatives for Linux
"PDF's progenitor PostScript is a page description language that
was invented in 1982, also by Adobe..."
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