>>chei0a+(OP)
The book referred to by the article -- `Platform Embedded Security Technology Revealed` -- appears to be available for download at no cost right now[1]. Pricing error or not, I've just completed checkout without issue.
For completeness, I have no affiliation or correction with Apress -- please consider this a heads-up.
[1] http://www.apress.com/9781430265719