When an author releases a program under a copyleft license, they make a claim on the copyright of the work and issue a statement that other people have the right to use, modify, and share the work as long as the reciprocity of the obligation is maintained. In short, if they are using a component with this kind of open source license, then they too must make their code open for use by others as well. A permissive open source license is a non-copyleft open source license that guarantees the freedom to use, modify, and redistribute, while also permitting proprietary derivative works.
That means that this type of license allows varying degrees of freedom to use, modify, and redistribute open source code, permitting its use in proprietary derivative works, and requiring nearly nothing in return in regards to obligations moving forward. Anyone can create an open source license that suits their fancy, which is the reason that there are so many out there.
This could make choosing an open source license complicated business, especially for those of us who are not well versed in the law and have never had open source licenses explained thoroughly. In order to help narrow down the decision and make sense of it all, the OSI put together a list of approved licenses, consisting of a little over 80 open source licenses that are most commonly used. Of the tens of open source licenses in the OSI approved list, some reign supreme and are used by some of the most popular open source projects out there.
GPL is a copyleft license. This means that any software that is written based on any GPL component must be released as open source. The result is that any software that uses any GPL open source component regardless of its percentage in the entire code is required to release its full source code and all of the rights to modify and distribute the entire code. To combine two codes into a larger work, both the programs must permit it.
The third difference between the two versions is that the GPLv3 was written in an attempt to increase usage worldwide. The language used in GPLv3 to describe the license rights was modified to ensure that international laws will interpret it as the FSF intended, unlike the language used in GPLv2 , which is considered very US-centric.
GPLv3 also allows developers to add local disclaimers, which also helps increase its usage outside the US. The Apache License allows you to freely use, modify, and distribute any Apache licensed product. In , when Berkeley accepted the argument put to it by the Free Software Foundation and retired their advertising clause from the BSD license and formed the modified BSD license, Apache did likewise and created the Apache License version 1.
Removing the advertising clause meant that the advertising materials of the derivative works of any Apache licensed product were no longer required to include the Apache License attribution.
It became ok to include the attribution in the documentation alone. Top 10 Apache License Questions Answered. The Microsoft Public License is a free and open source software license released by Microsoft, which wrote it for its projects that were released as open source. Open source software is made by many people and distributed under an OSD-compliant license which grants all the rights to use, study, change, and share the software in modified and unmodified form.
Software freedom is essential to enabling community development of open source software. Skip to main content. Home Contact Donate Login. Search form. About Open Source Licenses Open source licenses are licenses that comply with the Open Source Definition — in brief, they allow software to be freely used, modified, and shared. GNU AGPLv3 Permissions of this strongest copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license.
GNU GPLv3 Permissions of this strong copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license. Mozilla Public License 2. Apache License 2. MIT License A short and simple permissive license with conditions only requiring preservation of copyright and license notices.
Boost Software License 1. The Unlicense A license with no conditions whatsoever which dedicates works to the public domain. Commercial use Distribution Modification Patent use Private use. Disclose source License and copyright notice Network use is distribution Same license State changes.
Liability Warranty. Disclose source License and copyright notice Same license State changes.
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