/* Copyleft */ elaborate
'''Open Source''' is a software development model
being promoted by the non-profit '''Open Source Initiative (OSI)''' corporation and other organizations.
Open Source refers to [[software]] where the
[[source code ]] is available for anyone to modify. There are many different licenses under which open source software is available<ref>http://www.opensource.org/licenses/alphabetical</ref> , all varying slightly to the degree on the conditions under which the software can be modified and redistributed.
Although the development model for open source software may seem counter-intuitive, for many projects it has been shown to be very successful. Generally, open source software is distributed with the underlying source code available for anyone to freely modify and redistribute. This development model is very similar to university research and the '[[
Best of the public|best of the public]]' model, where discoveries and research are published in [[peer review |peer reviewed]] journals or other venues, which are then built upon by other researchers and contributors spawning further ideas and discoveries.
There is a common misconception that open source software must be given away for free, but this is incorrect.<ref>http://www.gnu.org/licenses/gpl-faq.html#DoesTheGPLAllowDownloadFee</ref> Although most open source software is indeed available for free, with the authors usually charging for consulting and other services, there is no obligation for them to do so.
*[http://www.mozilla.com/en-US/firefox/ Firefox] - [[Firefox]] web browser developed by the [http://www.mozilla.org/foundation/ Mozilla Foundation].
*[http://www.php.net/ PHP] - PHP: Hypertext Preprocessor, a scripting language used to create dynamic web sites such as Conservapedia.
*[[Linux]] - Operating system kernel used to create distributions such as the one running the server
on which Conservapedia runs<ref>http://toolbar.netcraft.com/site_report?url=http://www.conservapedia.com</ref>
A related concept is one espoused by [[Richard M. Stallman]] and his
followers: copyleft. Copyleft subverts copyright law to create a class of software code and art that only allows for redistribution of code as long as those using the code also allow it to be redistributed. That way, software is developed from each according to ability and used according to need. <ref>http://blog. lab49. com/archives/659</ref>
Copyleft as a mechanism requires that any software which uses code from copylefted software to be licensed under the same
terms -- making it copylefted as well. In the long run, this will lead to more and more software being licensed under copyleft terms. Not only that, but, due to the nature of copyleft, a lot less diversity in licenses is possible -- in fact, the most popular copyleft license, the GNU General Public License (GPL), is used for the majority of copylefted software. If this tendency will not be stopped, all open source software is soon to be licensed under one license.
[[Microsoft]] has claimed several times that the [[Linux]] kernel, as well as basic programs from most versions of Linux distributions, violates a number of patents Microsoft owns. While MS didn't disclose the actual patents violated, several companies who distribute [[Android]] or Linux-based devices decided to enter the patent agreement.
External links==*[ http://www.opensource.org/ Open Source Initiative]