Source code can also be distributed in text-based form like a PDF or scanable book which is what MIT did for Phil Zimmermann and later what 70 international volunteers did for the PGPi Scanning Project in 1997.
The Espresso Book Machine will turn a PDF file into a 300-page book in four minutes flat, at a cost of one penny per page including a full-color cover.
You can sign up as an early adopter of Lean Entrepreneur and choose one of four offers, ranging from a PDF of an earlier work, a PDF early version of the book, and the published version, to an enterprise offer of 30 books and online consultation.