Creating high-quality PDF documents require
expensive, high level commercial software. Although there were freeware apps
available, many of which based around Ghostscript technology, the final product never
really matched that of more professional software and generally, were
not good enough for commercial printing. PDFs are a popular, universal
file format that is useful for displaying all kinds of information, so
it's important to be able to download and read the literature contained
within these documents. 03 Dec 2009