Not so long ago, creating high-quality PDF documents required
expensive, high level commercial software, often far to expensive for the average computer user. Although there were freeware apps
available, the finished product never came close to some of the 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. 21 Jan 2010