^ Jump up to: a b c Shea, Tom (1983-06-23). "Free software - Free software is a junkyard of software spare parts". InfoWorld. Retrieved 2016-02-10. "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."

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