Just got this from Slashdot: (http://slashdot.org/)
"Ross Anderson, author of 'Security Engineering', notifies in a message to comp.risks that he just got permission from Wiley to let anyone download the full content of his book for free. This is one of the best books on computer security and it is used as textbook in many University courses (I teach two of them)."
Here is the link: http://www.cl.cam.ac.uk/~rja14/book.html
Odd. Just 4 hours later, and it doesn't.
Will try later too.
Here's the link to the pdf version: