I understand the basic concept of this free Packt book, so maybe it will have a broad enough appeal that at least someone will want it.
I hope that Packt locks out Google, the NSA, Facebook, and a host of other companies/organizations from getting this book. IMHO, they've already got too much data on each of us, and I don't want to help them use that data.
You've got just over 23 hours from nearly 8 p.m. ET United States to grab this ebook free.
https://www.packtpub.com/packt/offers/free-learning.