Free Software History Perspectives and Implications Source Code

Free Software: History, Perspectives and Implications

'Source Code' – Human readable documents that define a program's logic. Example: sub login { my $login = shift; my $password = shift; my $user = User->new(); my $query="Select id from User where login=? AND password=? "; my $id = $user->dbread('', $query, $login, $password); if ($id) { $user = $user->lookup($id->[0]); $user->{'session'} = &get. Session; $user->save; return $user; } else { return; } }

Early Software Development ● Specialized, expensive computers ● Run by highly-skilled technicians ● ● Extensive programming was required even for simple tasks Sharing of source code was commonplace

Creation of Software Industry ● Computer hardware became more powerful ● Allowed for more complex software ● ● Relative value of software increased, as cost of hardware decreased Technology companies begin to restrict their software

GNU Project ● GNU's Not Unix ● Create Fully Free Operating System ● Unix base meant tools could be run on many different types of computers

GNU General Public License ● Protects software from further restrictions ● 'copyleft' ● 'Free as in Speech, Not as in Beer'

Cathedral vs. Bazaar Models Cathedral Model ● ● ● Centralized Development Few core developers Only release stable code Bazaar Model ● De-centralized ● Many developers ● Open process ● Frequent releases

Use of Free Software ● Linux 'Clusters' – Many computers acting as one – 49 of 500 top supercomputers run free software – Also used in movie CGI: Titanic, Phantom Menace, Lord of the Rings made using Linux

Recipe Analogie ●Explanation of Programming ●Show some source code ●History ●Early days – pre software industry ●Stallman anecdote ●GPL ●Free as in Freedom ●Linux ●Widespread use of free software ●Benefits ●Cathedral vs. Bazaar ●Software is consumer-driven, not profit driven ●Given enough eyes, all bugs are shallow ●Motivations ●Identity ●ego/reputation ●For pay ●Oss business models ●Urge to create ●