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There are few examples so far [citation needed] of small and medium-sized enterprises having risked such a leap for their core business. UserLinux , a project set up by Bruce Perens , supported the emergence of such small-scale business based on free software , that is, copylefted or otherwise freely licensed computer programs.
Thus, copyleft licenses have conditions: that modifications of any work licensed under a copyleft license must be distributed under a compatible copyleft scheme and that the distributed modified work must include a means of modifying the work. Under fair use, however, copyleft licenses may be superseded, just like regular copyrights. Therefore ...
Open-source record labels are record labels that release music under copyleft licenses, that is, licenses that allow free redistribution and may allow free modification of the tracks. They present free, libre , and open content , and present this a part of the freedoms of expression and speech , with the goal of opening up the possibilities of ...
The GNU General Public Licenses (GNU GPL, or simply GPL) are a series of widely used free software licenses, or copyleft licenses, that guarantee end users the freedoms to run, study, share, or modify the software. [7] The GPL was the first copyleft license available for general use.
The most well known free software license that uses strong copyleft is the GNU General Public License. Free software licenses that use "weak" copyleft include the GNU Lesser General Public License and the Mozilla Public License. Examples of non-copyleft free software licenses include the X11 license, Apache license and the BSD licenses.
Pages in category "Copyleft software licenses" ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; ...
Some licenses are called "copyleft" licenses. Essentially, they have three key properties: A work licensed with a copyleft license can be copied at will. All published derivative works must use exactly the same license as the original: if you use the work, you're forced to use the same license for your own original work as well.
Permissive licenses come from academia. Copyleft licenses come from the free software movement. Copyleft licenses require derivative works to be distributed with the source code and under a similar license. Since the mid-2000s, courts in multiple countries have upheld the terms of both types of license.