Interesting development, more and more and more free culture:
The National Academies Press Makes All PDF Books Free to Download
* As of today all PDF versions of books published by the National Academies Press will be downloadable to anyone free of charge. This includes a current catalog of more than 4,000 books plus future reports produced by the Press. The mission of the National Academies Press (NAP) — publisher for the National Academy of Sciences, National Academy of Engineering, Institute of Medicine, and National Research Council — is to disseminate the institutions’ content as widely as possible while maintaining financial sustainability. To that end, NAP began offering free content online in 1994. Before today’s announcement, all PDFs were free to download in developing countries, and 65 percent of them were available for free to any user.
“Our business model has evolved so that it is now financially viable to put this content out to the entire world for free,” said Barbara Kline Pope, executive director for the National Academies Press. “This is a wonderful opportunity to make a positive impact by more effectively sharing our knowledge and analyses.”…
Printed books will continue to be available for purchase through the NAP website and traditional channels. The free PDFs are available exclusively from the NAP’s website, http://www.nap.edu/, and remain subject to copyright laws. – NAP