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PDF was designed out of PostScript, a programming language for producing final, static page representations. PDF represents the final presentation of a document, with formatting choices "baked-in". Useful for office documents and the printing industry, certainly, but wholly unsuited for an electronic version of a book, which needs to adapt to a variety of devices, resolutions, screen sizes, system fonts, and so on. Anyone producing PDF e-books misunderstands the e-book market.
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