This is a free 229 page PDF-based chess booklet, containing 20 instructive games on the London System. The positions can be clicked, to enable users to play real-time, create diagrams, etc.
This is designed to compliment the series of videos, published on YouTube. There is an instructional video, to help explain the features and benefits of the PDF.
You can share this PDF with friends (e.g. Facebook, Twitter, email, etc), or post it online (e.g. forums, blogs, websites, etc.). The only thing you cannot do, is sell it!