REVOLUTION OS tells the inside story of the hackers who rebelled against the proprietary software model and Microsoft to create GNU/Linux and the Open Source movement.
 http://www.revolution-os.com/

In 1981 IBM decided to "open the architecture" of its Personal Computer and so made possible for third party industries to start cloning it. Thus the particular architecture, from a patent of a company, became the standard in the
computers industry , so that the "closed architecture" of Apple computers lost a tremendous amount of market share. Even today only Apple can manufacture Mac's.
In a same way, the "open source" is a revolutionary model of software engineering against the patented "closed source" models software's created by companies like Microsoft.