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...

licenses rely on a copyright holder's power to license their work, as copyleft which also utilizes copyright for such a purpose. The public domain is...

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...

licenses. The two main categories of open-source licenses are permissive and copyleft. Both grant permission to change and distribute software. Typically, they...

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

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

financial penalties. Copyleft is a type of license that mandates derivative works to be licensed under the license's terms. Copyleft licenses exist for...

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

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

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...

copylefted works differs fundamentally if a free and open copyleft license is used or if the copyleft license is de facto a commercial one, restricting certain...

software, even copyleft free software, can use dual-licensing to allow themselves or others to redistribute proprietary versions. Non-copyleft free software...

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

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...

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

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...

complete operating system, designed as a clone of Unix and released under the copyleft GPL license. Thousands of Linux distributions exist, many based directly...

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

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

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

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

remix culture, the hacker culture, the access to knowledge movement, the copyleft movement and the public domain movement. In the late 1960s, Stewart Brand...

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

and Cromemco. He made early use of the word copyleft, in Palo Alto Tiny BASIC's distribution notice "@COPYLEFT ALL WRONGS RESERVED" in June 1976. The Homebrew...

Commercial minus sign Minus sign, Division sign, Per cent, Obelus 🄯, (ɔ) Copyleft sign Copyright sign © Copyright sign Sound recording copyright Circled...

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

Open-source record labels are record labels that release music under copyleft licenses, that is, licenses that allow free redistribution and may allow...

organization which produces copyleft hardware and software, in an attempt to apply the Free Software Foundation's GNU GPL concept of copylefting software to the hardware...

A notebook interface or computational notebook is a virtual notebook environment used for literate programming, a method of writing computer programs....