One of the most effective lecturers on the decentralized cryptocurrencies has put his book “Mastering Bitcoin: Unlocking Digital Cryptocurrencies” on GitHub as OpenSource: https://github.com/bitcoinbook/bitcoinbook
Publisher O’Reilly Media supports this move (8. min), so you can download everything as text (including .docs, draft of the Second Edition, and code), or you can download it as .pdf from this link
It may be interesting to see how Andreas M. Antonopoulos educates Senate of Canada about Bitcoin (Oct 8, 2014 ENG)
Government not a threat to Bitcoin
Bitcoin Cryptocurrency Crash Course with Andreas Antonopoulos
Andreas M. Antonopoulos is a technologist and serial entrepreneur who has become one of the most well-known and well-respected figures in bitcoin. He is the author of two books: “Mastering Bitcoin”, published by O’Reilly Media and considered the best technical guide to bitcoin and “The Internet of Money”, a book about why bitcoin matters.
As an engaging public speaker, teacher and writer, Andreas makes complex subjects accessible and easy to understand. As an advisor, he helps startups recognize, evaluate, and navigate security and business risks. Andreas was also one of the first to use the phrase “The Internet of Money”, as early as 2013, to describe bitcoin as part of his speaking business.
Source: Personal info