Copyleft is the legal technique of granting certain freedoms over copies of copyrighted works with the requirement that the same rights be preserved in...

BSD-like or BSD-style license, is a free-software license which instead of copyleft protections, carries only minimal restrictions on how the software can...

released under a permissive license may be referred to as "copycenter". Copyleft is a play on the word copyright and describes the practice of using copyright...

were of the "permissive" kind. In the mid-1980s, the GNU project produced copyleft free-software licenses for each of its software packages. An early such...

thing. The two main categories of open-source licenses are permissive and copyleft. Permissive licenses come from academia. They grant permission to modify...

rights reversed is a phrase that indicates a release of a publication under copyleft licensing status. It is a pun on the common copyright disclaimer "All rights...

generally find the same set of software to be acceptable, but sometimes see copyleft as restrictive. They generally advocate permissive free software licenses...

licenses, or copyleft, that guarantee end users the four freedoms to run, study, share, and modify the software. The license was the first copyleft for general...

restrictions on reuse and therefore has high license compatibility. Unlike copyleft software licenses, the MIT License also permits reuse within proprietary...

negotiate to combine code. Copyleft licenses are commonly deliberately incompatible with proprietary licenses, in order to prevent copyleft software from being...

work to be released under the same or similar license as the original. Copyleft licenses are free content or free software licenses with a share-alike...

proprietary) software without being required by the terms of a strong copyleft license to release the source code of their own components. However, any...

"weak" copyleft. "Weak" copyleft programs typically allow distributors to link them together with non-free programs, while "strong" copyleft strictly...

The GNU Free Documentation License (GNU FDL or simply GFDL) is a copyleft license for free documentation, designed by the Free Software Foundation (FSF)...

on the use and distribution of covered software. This is in contrast to copyleft licenses, which have share-alike requirements. The original BSD license...

based on the principle of copyleft, a kind of reciprocity: any work derived from a copyleft piece of software must also be copyleft itself. The most common...

permissive copyleft) Creative Commons Attribution Copyleft & patentleft licenses GNU GPL, LGPL (weaker copyleft), AGPL (stronger copyleft) Creative Commons...

proprietary. Some copyleft licenses block other means of turning software proprietary. Copyleft is a general concept. Copylefting an actual program requires...

The GNU Affero General Public License (GNU AGPL) is a free, copyleft license published by the Free Software Foundation in November 2007, and based on the...

Intellectual property Authors' rights Copyleft Copyright Database right Farmers' rights Geographical indication Indigenous intellectual property Industrial...

copyright notice and disclaimer. The Apache License is permissive; unlike copyleft licenses, it does not require a derivative work of the software, or modifications...

for copyleft licenses, especially the GPL, that allows derivative works only when permissions are preserved in modified versions of the work. Copyleft licenses...

abilities and willingness". Copyleft licenses are institutions which support a knowledge commons of executable software. Copyleft licenses grant licensees...

Design Science License (DSL) is a copyleft license for any type of free content such as text, images, music. Unlike other open source licenses, the DSL...

Day. Public records Center for the Study of the Public Domain Copyfraud Copyleft Copyright status of works by the federal government of the United States...

circle), and is used to designate copyright in a sound recording. The copyleft symbol 🄯 is a backwards capital letter C in a circle (copyright symbol...

share-alike (copyleft Licenses). An example of a copyleft free software license is the often used GNU General Public License (GPL), also the first copyleft license...

financial profit is expected to be much lower in a business model utilising copyleft works only than in a business using proprietary works.[opinion][better source needed]...

with the organization's preference for software being distributed under copyleft ("share alike") terms, such as with its own GNU General Public License...

adopters license related improvements they develop under the same terms. Copyleft-style licensors seek "continuous growth of a universally accessible technology...