The law surrounding OSS agreements and copyleft
is still evolving, Kunick says.
One reason why these communities continue to provide free solutions without legal protection is the social enforcement of the sharing ethic that copyleft
enforces with legal right.
licencija--bendroji viesoji licencija GPL (angl.
13, 2010) (recounting use of copyleft
licensing since the 1970s and
The GNU General Public License was the first popular copyleft
license, and it still dominates licensing of "copylefted
As explained by the Free Software Foundation (FSF), which claims ownership of the phrase "copyleft
" and one of the most widely used licenses, the GNU General Public License (GPL), copyleft
is "designed to make sure that you have the freedom to distribute copies of free software, that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
GPLs are an example of "copyleft
"--a licensing scheme which, says Wikipedia, can give every person who receives a copy of a work permission to reproduce, adapt or distribute it: as long as any resulting copies or adaptations are also bound by the same copyleft
Chapter 4 distinguishes the public and private sectors while Chapter 5 offers alternatives, including the Creative Commons and copyleft
movement (see COMMUNICATION RESEARCH TRENDS, Vol.
Such a license might be termed a flexible copyright, or meta license, that incorporates features of both proprietary copyright and open source copyleft
generally requires that if open source software is incorporated into proprietary source code, the entire source code (open source + proprietary) must be made available to others on the same terms as the existing public license.
is a play on the word copyright and is the practice of using copyright law to remove restrictions on distributing copies and modified versions of a work for others and requiring that the same freedoms be preserved in modified versions (GNU Operating System, What is Copyleft
Unlike GPLv3, the AGPLv3 license enforces copyleft
when software is distributed as a service (SaaS), which is a fundamental requirement when considering how consumers and enterprises purchase and use software today.