Out-of-copyright books are set to to become free to download and print via Google.

Google has been scanning books from libraries, including those at Harvard University, Stanford University, Oxford University and the New York Public Library.

Titles it will offer to be viewed online and for download to Adobe Acrobat PDF format include Sir Isaac Newton's Principia, Aesop's Fables and Dante's Inferno.

Once people have downloaded the PDF file they will be free to print it out.

Read more: Web User