As some of you know, The WikiLeaks dump of "Vault7" contained, among other things, a 2015 copy of my "Android Internals" book, since Technologeeks provided training for them. Though by now a bit outdated, it's still a high quality, color PDF updated for Marshmallow PR1, and is about 85% the same as the existing book I provide, which is updated to Nougat 7.1 - Android changes rapidly, but the core isn't radically different.
Right here ←
NO, I cannot retroactively refund everyone who bought the book, but I do thank you for respecting the insane amount of work I put into it, and not releasing the PDF publicly. I will still maintain updates for whatever Google concocts with Android O, and naturally all my tools will remain free.
I hope you enjoy the book, and encourage you to look at the Technologeeks Training we offer on it. And thank you all for your interest!