This documentary uses interviews to trace the origins of Linux, and in the process, it provides an interesting insight into the open source movement and its philosophy. Richard Stallman, founder of the GNU project, is featured prominently throughout the film. (GNU is a set of applications that provide a UNIX-compatible framework.) He explains how GNU was developed through the open source environment, an environment where code can be taken, modified, and shared, but it cannot be made proprietary. He also explains the development of the GNU General Public License which prohibits developers from making the code proprietary.