Searching Books Between the Covers / Infotoday, Vol.29. No. 3 May/June, 2005

http://www.infotoday.com/online/may05/OnTheNet.shtml
Greg R Notess
"To find information inside a printed book, people traditionally rely on an index or, for a few works, a concordance. With the advent of e-books, however, people could search the entire text, assuming they bought the e-book. Although a growing number of copyright-free books are now on the Web, those still under copyright remained unsearchable�until now. "