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From the Schneier on Security blog

Ross Anderson’s fantastic textbook, Security Engineering, will have a third edition. The book won’t be published until December, but Ross has been making drafts of the chapters available online as he finishes them. Now that the book is completed, I expect the publisher to make him take the drafts off the Internet.

I personally find both the electronic and paper versions to be incredibly useful. Grab an electronic copy now while you still can.