The 38-volume collection that the Ignatius CD is based on (published 1819-1893) is long out of copyright protection. CD's of the contents may be purchased very inexpensively (or freely copied and distributed). I bought one on eBay for three dollars. There are also online sites (such as http://www.ccel.org/fathers2
) that offer this same information (for free) which you can read online or download as text/HTML/Acrobat files. You can (legally) obtain the entire collection on most file sharing services.
The CD I bought is a bunch of text files with an HTML index (so you can view/read in a browser if you prefer, or use a word processor). It has no built-in search ability, but you can use your own computer's file search tools to find relevant data (the same way you would content-search for any other type of document on your machine).
The content includes the original publisher's introductions, prefaces and footnotes for the individual writings, many of which bear a distinctly protestant overtone (the writings were compiled and distributed by a protestant publishing house). The quality of some translations is considered poor by more modern standards, but the publisher used the best available at the time.
Ignatius has included a search engine (with hit ranking) as a value-added component to the freely available content. It is up to the buyer to decide if a search engine is worth the $60 they charge for the CD.