"In many ways the differences between the Free Software and Open
Source software movements have more to do with social goals than
the software itself. The Free Software movement had its roots in
Richard Stallman's initial effort to create a 'free' operating
system. This effort led him to quit a job at MIT and begin working
on it full-time. His primary goal and motivation was to create
something to which all users had free and open access and that
could be inspected and modified by the users themselves.
"He quit his job to dedicate all his time to this and to ensure
that MIT would have no possibility of copyright or patent claims
based on any of the work he did..."