Shea, Tom (1983年6月23日). “Free software - Free software is a junkyard of software spare parts”. InfoWorld. 2016年2月10日閲覧。 “"In contrast to commercial software is a large and growing body of free software that exists in the public domain. Public-domain software is written by microcomputer hobbyists (also known as "hackers") many of whom are professional programmers in their work life. [...] Since everybody has access to source code, many routines have not only been used but dramatically improved by other programmers."”
