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Unformatted text preview: CS 6
CopyLeft / Software Open Source If copyright and patents limit a
program’s use and modification,
how do we create a program
guaranteed to stay free? Open Source
Answer: create a copyright which
requires an item be free to use, study,
modify, and redistribute.
Many licenses have been created to
enforce this, differing slightly for their
purpose and application. Hallmarks of licenses:
Free Redistribution: the software can be freely given away or
Source Code: the source code must either be included or freely
Derived Works: redistribution of modifications must be allowed.
Integrity of The Author's Source Code: licenses may require
that modifications are redistributed only as patches.
No Discrimination Against Persons or Groups: no-one can be
No Discrimination Against Fields of Endeavor: commercial
users cannot be excluded.
Distribution of License: The rights attached to the program must
apply to all to whom the program is redistributed without the need
for execution of an additional license by those parties. Who writes this?
Students working for degrees.
Programmers working collaboratively, for
fun, or for prestige.
Companies who plan on giving away the
software, but offering optional installation
and support at cost. (Linux) “[A]t the end of 2005, 61.2% of code had
been developed by individuals, according
to copyright and credit claims, while
19.2% was claimed by companies, 5.6%
universities, and 7.9% foundations.“ –
European Commission Companies:
RedHat (linux) Schools:
Carnegie Mellon Benefits of Open Source:
Shared work, shared effort:
lower development costs Larger brain pool
Larger testing pool (you)
Lower barrier for new
(mostly) Free of artificial marketing
decisions Examples of Open source
Mozilla Firefox - web browser
Mozilla Thunderbird - e-mail client
OpenOffice.org - office suite
7-zip – alternative to winzip
GIMP – alternative toPhotoshop
Linux kernel - operating system kernel based on Unix
Apache - HTTP web server
Eclipse - software framework for "rich-client applications"
Tomcat web server - web container
Blender - 3D graphics application
Moodle - course management system
OpenSolaris - Unix Operating System from Sun Microsystems
Mediawiki - wiki server software, the software that runs Wikipedia
Aras Innovator - Microsoft open source business process management enterprise software
Drupal - content management system
Joomla! - content management system
GNU Compiler Collection - Programming language compiler for C, C++, Java and other languages.
phpBB - open source bulletin board system
Nvu - open source WYSIWYG HTML editor (webpage/website builder)
Audacity - open source audio recording software
StCAD-open source 3D Framework for Smalltalk
Adempiere-open source ERP/CRM Not all free software is open source
Examples: } AVG antivirus
Adobe PDF viewer
Spyboy Search and Destroy
(may not have
support) Not all free software is good
Http://www.download.com/ hosts most, if
not all free software, along with:
Free to try OR actually Free
User’s rating “Free to Try” Software can be called:
Hobbleware Beware free Utilities
Free utilities don’t come with traditional
safeguards – you can hurt your
Feel free to play around with anything
you want, as long as you:
Don’t mess with the bios
Are prepared to loose everything and
completely reinstall. Mirrors
Often a file is highly desirable. To
distribute the load, many companies and
universities offer to mirror the file on
their own server.
When you choose the mirror, pick the
one geographically closest to you. What do I download?
Check the OS:
OSX Executable (.exe) sometimes .zip, .rar
Not Source Code! What do I download?
Alpha: still under development
Beta: first testing release
major.minor.revision.build Before Downloading:
Note antivirus icon in toolbar Save file to disk (so antivirus sees it) What Software Makes the Internet Easier?
Browser (FireFox) + plugins
Email Client (Thunderbird)
Chat Client (Trillian)
CutePDF (save confirmations, research)
Antivirus (AVG or NOD32)
AntiSpyware (Adaware, Spybot, AVG)
Firewall (ZoneAlarm) Mozilla Firefox
Plug-ins and extensions you should use
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- Summer '11