Licenses which implement copyleft can be used to maintain copyright conditions for works ranging from computer software, to documents, art, and scientific discoveries, and similar approaches have even been applied to certain patents. [1]

2022年1月2日 · The GNU Free Documentation License (FDL) is a form of copyleft intended for use on a manual, textbook or other document to assure everyone the effective freedom to copy and redistribute it, with or without modifications, either commercially or noncommercially.

2016年8月12日 · As explained in the previous section, a copyleft license means downstream projects cannot add additional restrictions on the use of the software. This is best illustrated with an example. If I wrote MyCoolProgram and distributed it under a copyleft license, you would have the freedom to use and modify it.

Copyleft is the opposite of copyright, and is used widely in Open Source development, the copyleft license allows creators, contributors, and maintainers to make changes to open source projects, and share them with the community.

2021年5月10日 · Currently, the most-used copyleft license in open source software is the GNU GPL v2, which has been in wide use for 20 years. The primary differences between copyleft and permissive licenses are compliance requirements and …

2024年9月9日 · A copyleft license is a type of open-source license that allows users to freely use, modify, and distribute a work, provided that any derivative works are also distributed under the same license terms.

Understanding copyleft licenses at a high level unlocks a world of new software, from Linux to WordPress to LibreOffice and more. Experts distinguish two kinds of open software licenses: Permissive licenses give everyone the right to do nearly anything with software, for free.

2021年2月23日 · Copyleft licenses are linked to the principle of reciprocity where authors want to ensure that any derived work (modifications, improvements) are also made available as open source and to the benefit of the public (and not released as closed source).

2021年3月3日 · There are various copyleft licenses available, offering varying degrees of protection and license grants. The most well-known license with copyleft attributes include the GNU General Public License (GPL) and the Creative Commons share-alike license (CC-BY-SA).

The copyright holders grant the freedom to copy, modify, convey, adapt, and/or redistribute this work (except Appendices B – E) under the terms of the Creative Commons Attribution Share Alike 4.0 International License. A copy of that license is available at https://creativecommons.org/licenses/by-_sa/4.0/legalcode.