OpenSource.09.ppt

Free Software
• “Free” software “is software that can be used, studied,
and modified,” copied, changed with little or no
restriction, and which can be copied and redistributed in
modified or unmodified form. Free software is available
gratis (free of charge) in most cases.
• “In practice, for software to be distributed as free
software, the human-readable form of the program
(the source code) must be made available” along “ with
a notice granting the” user permission to further adapt
the code and continue its redistribution for free.
• This notice either grants a "free software license", or
releases the source code into the public domain.
http://en.wikipedia.org/wiki/Free_software
Copyright © 2009 by Helene G. Kershner

Open Source Software
• In the beginning, all software was free
– in the 1960s ,when IBM and others sold the first large-scale
computers, these machines came with software which was
free.
– This software could be freely shared among users,
• The software came written in a programming language (source
code available), and it could be improved and modified.
• Manufacturers were happy that people were writing software
that made their machines useful. (1)
• Then proprietary software dominated the software landscape as
manufacturers removed access to the source code.
– IBM and others realized that most users couldn’t or didn’t want to
“fix” their own software and
– There was money to be made in leasing or licensing software.
Adapted from http://eu.conecta.it/paper/brief_history_open_source.html
(1)http://en.wikipedia.org/wiki/Free_software

• By the mid-1970s almost all software was proprietary
• “Proprietary software is software that is owned by an
individual or a company (usually the one that developed
it). There are almost always major restrictions on its use,
and its source code is almost always kept secret.” (1)
users were not allowed to redistribute it,
– source code is not available
– users cannot modify the programs.
– Software is an additional product that was for sale
– In 1980 US copyright law was modified to include software (1)
(1) http://en.wikipedia.org/wiki/Free_software

• In late 1970s and early 1980s, two different groups
started what became known as the open source
software movement:
• East coast, Richard Stallman (1985), formerly a
programmer at the MIT AI Lab, launched the GNU
Project and the Free Software Foundation.
– “to satisfy the need for and give the benefit of ‘software
freedom’ to computer users.” (1)
– ultimate goal of the GNU Project was to build a free operating
system
– the GNU General Public License (GPL) was designed to
ensure that the software produced by GNU will remain free,
and to promote the production of more and more free
software.
(1) http://en.wikipedia.org/wiki/Free_software

Free Software Foundation
Guiding Principles
• “Free software is a matter of liberty, not price.
• To understand the concept, you should think of free as
in free speech (right), not as in free beer (gift).
• Free software is a matter of the users' freedom to run,
copy, distribute, study, change and improve the software.
– The freedom to run the program, for any purpose (freedom 0).
– The freedom to study how the program works, and adapt it to
your needs (freedom 1). Access to the source code is a
precondition for this.
– The freedom to redistribute copies so you can help your
neighbor (freedom 2).
– The freedom to improve the program, and release your
improvements (and modified versions in general) to the public,
so that the whole community benefits (freedom 3). Access to the
source code is a precondition for this.” http://www.gnu.org/philosophy/free-sw.html

Guiding Principles
• “A program is free software if users have all of these
freedoms. Thus, you should be free to redistribute
copies, either with or without modifications, either gratis
or charging a fee for distribution, to anyone anywhere.
Being free to do these things means (among other
things) that you do not have to ask or pay for permission.
• You should also have the freedom to make modifications
and use them privately in your own work or play, without
even mentioning that they exist. If you do publish your
changes, you should not be required to notify anyone in
particular, or in any particular way.” http://www.gnu.org/philosophy/free-sw.html
• This is a philosophy, a world view.

• Very counter-culture
• Hacker is considered a “good-guy”
– “Hacker (computer security) someone involved in computer
security/insecurity
– Hacker (programmer subculture), a programmer subculture originating
in the US academia in the 1960s, which is nowadays mainly notable for
the free software/open source movement
– Hacker (hobbyist), an enthusiastic home computer hobbyist”
http://en.wikipedia.org/wiki/Hacker
• Cracker is a “bad-guy”
– A cracker is someone who cracks software or digital media
– “Software cracking is the modification of software to remove protection
methods: copy protections, trial/demo version, serial number, hardware
key, date checks, CD check or software annoyances like nag screens
and adware”. http://en.wikipedia.org/wiki/Cracker_(computing)

• West coast, the Computer Science Research Group
(CSRG) of the University of California at Berkeley was
improving the Unix system, and building applications
which quickly become “BSD Unix”.
• Unix was initially developed by AT&T employees (1)
– efforts were funded mainly by DARPA contracts
– a network of Unix programmers around the world helped to
debug, maintain and improve the system.
– in late 1980s, distributed under the ``BSD license'' (one of the
first open source licenses).
– Unfortunately, still contained some components that were
proprietary requiring a license from AT&T
(1)http://en.wikipedia.org/wiki/UNIX

• During the 1980s and early 1990s, open source
software continued its development, initially in
several relatively isolated groups.
• Slowly, much of the software was integrated
• The various groups merged
• As a result of this, complete operating environments
could be built on top of Unix using open source
software.
• Many Internet ISPs use UNIX as their operating
system of choice.

• 1991-1992, the open source world improved
• In California, Bill Jolitz implementing a version of
BSD Unix free of AT & T’s copyright.
– The work was covered by the BSD license making it
completely free.
– It included other free software GNU licenses

• Also during 1991-1992
• In Finland, Linus Torvalds, a Finnish computer science
student, was implementing the first versions of Linux.
• Other people joined to collaboration to create the
GNU/Linux operating system.
• By 1993, both GNU/Linux and BSD Unix were free
stable operating environments.
– Both continue to evolve

• “Open source is a development method for software that
harnesses the power of distributed peer review and
transparency of process.
• The promise of open source is better quality, higher
reliability, more flexibility, lower cost, and an end to
predatory vendor lock-in.
• The Open Source Initiative (OSI) is a non-profit
corporation formed to educate about and advocate for
the benefits of open source.”
• OSI includes a standards body, maintaining the Open
Source Definition for the good of the community.
http://www.opensource.org/

• Today there are many who believe proprietary software
is the only possible model
– Microsoft
– Apple, especially for the iPod and iPhone
• Recently the software industry has begun to considered
free software as an option again.
– Apple’s OS X and Leopard are based on Unix
– Google’s Chrome
– Mozilla Firefox

Open Source vs Proprietary Software
Why choose proprietary software over open source? Survey says!by Matt Asay http://news.cnet.com/8301-13505_3-9789275-16.html

See for Yourself
Revolution OS
• “Revolution OS is a 2001 documentary which traces the history of
GNU, Linux, and the open source and free software movements. “
http://video.google.ca/videoplay?docid=7707585592627775409
• Richard Stallman & Opensource
http://www.youtube.com/watch?v=kSZZraHN0Yg&feature=PlayList&
p=65CA10D0F42E48FD&playnext=1&playnext_from=PL&index=7
• Free software CNet
http://www.youtube.com/watch?v=a9fqlI9B6QU&feature=PlayList&p
=65CA10D0F42E48FD&playnext=1&playnext_from=PL&index=9
• Linux -- IBM
http://www.youtube.com/watch?v=KwEWxpOWOok
• Linux commercials
http://www.youtube.com/watch?v=aufL76bXLAg&feature=related

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