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Enforcement of legal freedoms in all derivatives of a work
Copyleft is the legal technique of granting certain freedoms over copies of copyrighted works with the requirement that the same rights be preserved in
Copyleft
Free licensed works in any field
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
Free_content
License allowing software modification and redistribution
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
Free-software_license
License with minimal restrictions
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
Permissive_software_license
Software license allowing source code to be used, modified, and shared
licenses. The two main categories of open-source licenses are permissive and copyleft. Both grant permission to change and distribute software. Typically, they
Open-source_license
Legal instrument governing software
financial penalties. Copyleft is a type of license that mandates derivative works to be licensed under the license's terms. Copyleft licenses are free and
Software_license
Permissive free software license
puts few restrictions on reuse and has high license compatibility. Unlike copyleft software licenses, the MIT License allows reuse within proprietary software
MIT_License
Free-software license
proprietary) software without being required by the terms of a strong copyleft license to release the source code of their own components. However, any
GNU Lesser General Public License
GNU_Lesser_General_Public_License
Software licensed to be freely used, modified and distributed
generally find the same set of software to be acceptable, but sometimes see copyleft as restrictive. They generally advocate permissive free software licenses
Free_software
Family of Unix-like operating systems
was originally designed as a clone of Unix and is distributed under the copyleft GPL license. There are many thousands of Linux distributions, many based
Linux
Ethical dilemma
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
Commercial use of copyleft works
Commercial_use_of_copyleft_works
Software released under a license restricting rights
software, even copyleft free software, can use dual-licensing to allow themselves or others to redistribute proprietary versions. Non-copyleft free software
Proprietary_software
Series of free software licenses
GPL) are a series of widely used free software licenses. The GPL is a copyleft license, which means that it guarantees end users the freedom to run, study
GNU_General_Public_License
Pun indicating copyleft licensing status
reversed is a phrase that indicates a release of a publication under a copyleft license. It is a pun on the common copyright disclaimer "All rights reserved"
All_rights_reversed
Type of free software license
on the use and distribution of covered software. This is in contrast to copyleft licenses, which have share-alike requirements. The original BSD license
BSD_licenses
minus sign Minus sign, Division sign, Per cent sign, Obelus 🄯 Copyleft symbol Copyleft sign Copyright sign © Copyright sign Copyright sign Sound recording
List of typographical symbols and punctuation marks
List_of_typographical_symbols_and_punctuation_marks
Groups of software
proprietary. Some copyleft licenses block other means of turning software proprietary. Copyleft is a general concept. Copylefting an actual program requires
Software_categories
Type of license agreement
Permissive licenses began in academia, and Copyleft licenses began in the free software movement. Copyleft licenses also require derivative works to be
Free_license
Software copyright issue
negotiate to combine code. Copyleft licenses are commonly deliberately incompatible with proprietary licenses, in order to prevent copyleft software from being
License_compatibility
Free software license based on the AGPLv1 and GPLv3
The GNU Affero General Public License (GNU AGPL) is a free copyleft license published by the Free Software Foundation in November 2007, based on the GNU
GNU Affero General Public License
GNU_Affero_General_Public_License
Copyright license for free use of a work
Madrid, and represented by Javier de la Cueva) was granted the use of copyleft music in their public activities. The sentence said: Admitting the existence
Creative_Commons_license
Free software project
"weak" copyleft licenses. "Weak" copyleft programs typically allow distributors to link them together with non-free programs, while "strong" copyleft strictly
GNU_Project
Free-software license
copyright notice and disclaimer. The Apache License is permissive; unlike copyleft licenses, it does not require a derivative work of the software, or modifications
Apache_License
Shadow library search engine
which criticize existing copyright law and have been associated with the copyleft movement. Since 2023, Anna's Archive domains have appeared in the annual
Anna's_Archive
Social movement concerning creative works
remix culture, the hacker culture, the access to knowledge movement, the copyleft movement and the public domain movement. In the late 1960s, Stewart Brand
Free-culture_movement
Royalty-free patent licensing
adopters license related improvements they develop under the same terms. Copyleft-style licensors seek "continuous growth of a universally accessible technology
Patentleft
Freely licensed software with open code
easier. The GNU General Public License (GPL) is one of the most widely used copyleft licenses in the free and open-source software (FOSS) community and was
Free_and_open-source_software
C standard library for Android operating system
BSD-licensed: Google wanted to isolate Android applications from the effect of copyleft licenses to create a proprietary user-space and application ecosystem,
Bionic_(software)
Organization designing open copyright licenses
Matthew Haughey. Creative Commons has been an early participant in the copyleft movement, which seeks to provide alternative solutions to copyright, and
Creative_Commons
American computer programmer (born 1935)
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
Li-Chen_Wang
least "Compatible with GPL" and preferably copyleft. The OSI recommends a mix of permissive and copyleft licenses, the Apache License 2.0, 2- & 3-clause
Comparison of free and open-source software licenses
Comparison_of_free_and_open-source_software_licenses
Type of copyright license
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
Design_Science_License
The copyleft symbol 🄯 is a backwards capital letter C in a circle (copyright symbol © mirrored). It has no legal meaning. Law portal Copyleft – Enforcement
Copyright_symbol
Type of copyright licence with no royalties or per-use fees
Copyleft Articles on copyleft licensing Topics Copyleft Open-source license Free-software license Free and open-source software Royalty-free Higher categories:
Royalty-free
Organization supporting the free software movement
software movement, with its preference for software being distributed under copyleft ("share alike") terms, such as with its own GNU General Public License
Free_Software_Foundation
Software licensing practice
are made available as stipulated by a copyleft license. However, a copyright holder's commitment to elude copyleft provisions and advertise proprietary
Multi-licensing
Collectively shared and managed information
abilities and willingness". Copyleft licenses are institutions which support a knowledge commons of executable software. Copyleft licenses grant licensees
Knowledge_commons
Programming tool blending code and documents
A notebook interface or computational notebook is a virtual notebook environment used for literate programming, a method of writing computer programs.
Notebook_interface
Website providing torrent files and magnet links
Internet portal Freedom of speech portal Comparison of BitTorrent sites Copyleft – Enforcement of legal freedoms in all derivatives of a work Criticism
The_Pirate_Bay
Works outside the scope of copyright law
Mark Public records Center for the Study of the Public Domain Copyfraud Copyleft Copyright status of works by the federal government of the United States
Public_domain
Copyleft license developed by MongoDB Inc.
The Server Side Public License (SSPL) is a non-free strong copyleft software license first introduced by MongoDB Inc. in 2018. It includes most of the
Server_Side_Public_License
American activist and programmer (born 1953)
Debugger, and GNU Emacs text editor. Stallman pioneered the concept of copyleft, which uses the principles of copyright law to preserve the right to use
Richard_Stallman
Web browser made by Mozilla
version 1.1, which the Free Software Foundation criticized for being weak copyleft, as the license permitted, in limited ways, proprietary derivative works
Firefox
Free online crowdsourced encyclopedia
Wikipedia was covered by the GNU Free Documentation License (GFDL), a copyleft license permitting the redistribution, creation of derivative works, and
Wikipedia
Free and open-source software forge
February 2024, In August 2024, Forgejo moved from the MIT license to the copyleft GNU General Public License. While the original code is still MIT-licensed
Forgejo
Exercise of digital rights management on copyleft software
of designing hardware that incorporates software under the terms of a copyleft software license like the GNU General Public License (GNU GPL), but uses
Tivoization
Copyleft license primarily for free software documentation
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
GNU Free Documentation License
GNU_Free_Documentation_License
Database on corporate entities
OpenCorporates is a website that shares data on corporations under the copyleft Open Database License. The company, OpenCorporates Ltd, was incorporated
OpenCorporates
Application of open-source methodologies to religious belief
Li-Chen Wang stated ‘(ↄ) COPYLEFT ALL WRONGS RESERVED’. In 1984–5 programmer Don Hopkins sent Richard Stallman a letter labeled "Copyleft—all rights reversed"
Open-source_religion
Legal concept regulating rights of a creative work
Further refinements to these definitions have resulted in categories such as copyleft and permissive. Common examples of free licenses are the GNU General Public
Copyright
Deliberate creation of difficult-to-understand code
add-on stores. There has been debate on whether it is illegal to skirt copyleft software licenses by releasing source code in obfuscated form, such as
Obfuscation_(software)
Type of reference work
million articles in more than 80 languages with content licensed under the copyleft GNU Free Documentation License. As of August 2009,[update] Wikipedia had
Encyclopedia
organization which produced copyleft hardware and software, in an attempt to apply the Free Software Foundation's GNU GPL concept of copylefting software to the hardware
Qi_Hardware
American entertainment media conglomerate
advertising and sold content, publishing most user-provided text under copyleft licenses. The company also runs the associated Fandom editorial project
Fandom_(website)
Social movement
copyleft licensing schema (often pejoratively called "viral licenses"). In its strongest form, copyleft mandates that any works derived from copyleft-licensed
Free_software_movement
Society at Harvard Law School aimed at releasing case arguments under a copyleft license, in order to encourage public suggestions for improvement. Berkman
Openlaw
Software license
The Q Public License (QPL) is a non-copyleft license, created by the company Trolltech for its free software edition of the Qt toolkit and framework. It
Q_Public_License
Free and open-source software license
address some of the problems of the MPL. Like the MPL, the CDDL is a weak copyleft license in-between GPL license and BSD/MIT permissive licenses, requiring
Common Development and Distribution License
Common_Development_and_Distribution_License
Operating system for mobile devices
most of the code (including network and telephony stacks) under the non-copyleft Apache License version 2.0. which allows modification and redistribution
Android_(operating_system)
Book by Richard Brautigan
Mine Disaster. In the original 1967 publication, Brautigan included a copyleft statement which retains copyright but grants permission to reprint any
All Watched Over by Machines of Loving Grace (poetry collection)
All_Watched_Over_by_Machines_of_Loving_Grace_(poetry_collection)
Topics referred to by the same term
or ideology Centre-left politics Far-left politics The Left (Germany) Copyleft Leaving (disambiguation) Lefty (disambiguation) Sinister (disambiguation)
Left
Hardware from the open-design movement
general copyleft licenses the GNU General Public License (GPL) and Creative Commons Attribution-ShareAlike license, from the hardware-specific copyleft licenses
Open-source_hardware
Music that allows derivative works
musicians contributing music to the copyleft commons. This may be due to the relatively recent emergence of copyleft music, as well as to the fact that
Open_music
Copyright terms
CLAs are important especially for corporate open source projects under a copyleft license, since without a CLA the contribution would restrict the guardian
Contributor_license_agreement
Permissive free software license
The GNU All-permissive License is a lax, permissive (non-copyleft) free software license, compatible with the GNU General Public License, recommended by
GNU_All-permissive_License
Collection of Unix tools in single executable file
BusyBox uses the copyleft GNU General Public License, which led to different usage domains. BusyBox is mostly used in the copyleft FOSS domain, while
Toybox
Pirate Parties International (pirate politics) Anti-copyright movement Copyleft movement Copyright abolitionism Free-culture movement Anti-corruption movement
List_of_political_ideologies
Name that a business trades under for commercial purposes
Intellectual property Authors' rights Copyleft Copyright Database right Farmers' rights Geographical indication Indigenous intellectual property Industrial
Trade_name
1987 text-based roguelike video game
original authors from litigation. The NetHack General Public License is a copyleft software license certified as an open source license by the Open Source
NetHack
Dissenting views of copyright law
legal framework with special licences to achieve their goals, include the copyleft movement and Creative Commons. Creative Commons is not anti-copyright per
Criticism_of_copyright
American consumer electronics company
the lawsuit that Vizio was "not providing and technical information that copyleft licenses require, Vizio was not even informing its customers about copylefted
Vizio
American animator, cartoonist and activist (born 1968)
Adventures, Fluff, and all the original work in Sita Sings The Blues, under a copyleft license. Since January 2021, Paley runs the gender critical podcast Heterodorx
Nina_Paley
Type of record label
Open-source record labels are record labels that release music under copyleft licenses, that is, licenses that allow free redistribution and may allow
Open-source_record_label
Business models that can be compatible with open source software projects
Cloudera's Apache Hadoop-based software. If a software product is under a copyleft license, the copyright holders may opt to sell exceptions to customers
Business models for open-source software
Business_models_for_open-source_software
Policy document by the Open Source Initiative
open-source rights to everyone who receives a copy of the program. Covering both copyleft and permissive licenses, it is effectively identical to the definition
The_Open_Source_Definition
Letter of the Latin alphabet
est", "scilicet" or similar. This letter is often used to refer to the Copyleft official sign, which looks like an open o with a circle around it. Open
Open_O
Command-line and GUI plotting program
Debian FSG compatible Yes FSF approved Yes OSI approved Yes GPL compatible No Copyleft No Website sf.net/p/gnuplot/gnuplot-main/ci/master/tree/Copyright
Gnuplot
Permissive free software license
its own license, separate from everything else". They also preferred a copyleft license, stating, "If a company uses our software but improves it, we really
ISC_license
Concept of copyright applied to computer code
licenses also rely on copyright law to enforce their terms. For instance, copyleft licenses impose a duty on licensees to share their modifications to the
Software_copyright
Collection of copyleft desktop backgrounds
Collection of copyleft desktop backgrounds
Propaganda (desktop backgrounds)
Propaganda_(desktop_backgrounds)
Software license under which the PHP scripting language is released
developers citing the restrictions on reuse associated with the GPL's copyleft enforcement as being the reason for dropping it. The Zend Engine, the core
PHP_License
project, OsmocomBB. Generally, the phones included on this list contain copyleft software other than the Linux kernel, and minimal closed-source component
List of open-source mobile phones
List_of_open-source_mobile_phones
2005 science fiction novel by Charles Stross
and rtf versions of Accelerando available for download from his blog. Copyleft Post-scarcity Simulated reality Singularity Sky, another Stross novel dealing
Accelerando
Permissive free software license
The WTFPL intends to be a permissive, public-domain-like license (not a copyleft). It differs from public domain in that an author can use it even if their
WTFPL
Software in the public domain
of permissive licensed software) or license compatibility (issue with copyleft licensed software). Under the Berne Convention, which most countries have
Public-domain_software
Ownership of creative expressions and processes
writer and political activist Lawrence Lessig, along with many other copyleft and free software activists, has criticized the implied analogy with physical
Intellectual_property
Free software license by W3C
W3C-20150513, W3C Debian FSG compatible Yes FSF approved Yes OSI approved Yes GPL compatible Yes Copyleft No Linking from code with a different license Yes
W3C Software Notice and License
W3C_Software_Notice_and_License
Concept in United States copyright law
Copyright limitations, exceptions, and defenses in the U.S. Copyfraud Copyleft Creative Commons Derivative work Fair use (U.S. trademark law) The Polish
Fair_use
Free and open-source office software suite
a preference for permissive licenses, such as the Apache license, over copyleft license. The developer pool for the Apache project was seeded by IBM employees
Apache_OpenOffice
Independent software derived from existing software
proprietary software, and copyleft proponents say that commercial incentives thus make proprietisation almost inevitable. (Copyleft licenses can, however
Fork_(software_development)
Defunct free-content news wiki
moved out of the "demo" stage and into the beta stage under public domain copyleft. A German language edition was launched at the same time. Soon, editions
Wikinews
Software licensed to ensure source code usage rights
distribution of their works. Strong copyleft licenses require all derivative works to use the same license while weak copyleft licenses require the use of the
Open-source_software
Type of free content license
The Free Art License (FAL) (French: Licence Art Libre, LAL) is a copyleft license that grants the right to freely copy, distribute, and transform creative
Free_Art_License
Free and open-source Unix-like operating system
Documentation License, described by the GNU Project as "a lax, permissive non-copyleft free documentation license that is compatible with the GNU FDL". The documentation
FreeBSD
Chinese multinational electronics company
Public License. The Android project's Linux kernel is licensed under the copyleft terms of the GPL, which requires Xiaomi to distribute the complete source
Xiaomi
EFL-1.0, EFL-2.0 Debian FSG compatible Yes FSF approved Yes OSI approved Yes GPL compatible Yes Copyleft No Linking from code with a different license Yes
Eiffel_Forum_License
Most of the tools used with linux are GNU software and are under the GNU copyleft. These tools aren't in the distribution - ask me (or GNU) for more info
History_of_Linux
Optional clause for the GNU General Public License
publishing. As explained by Dave Crossland in Libre Graphics Magazine: "A copyleft font may overreach into the documents that use it, unless an exception
GPL_font_exception
Danish software developer
Foundation, the license would be classified as an "informal" free, non-copyleft and GPL-compatible license, however more detailed licenses are recommended
Poul-Henning_Kamp
Prevent third parties from using intellectual property
Intellectual property Authors' rights Copyleft Copyright Database right Farmers' rights Geographical indication Indigenous intellectual property Industrial
Brand_protection
COPYLEFT
COPYLEFT
COPYLEFT
COPYLEFT
Boy/Male
British, English, French
Steward; Bailiff; In the Middle Ages a Bailiff was a Minor Officer of the Law
Boy/Male
Muslim/Islamic
Entertaining companion
Girl/Female
Indian
Initiation
Boy/Male
Arabic
Security
Girl/Female
Indian, Tamil
Name of a Raaga
Boy/Male
Gujarati, Hindu, Indian
Victory of Lord Shiva
Surname or Lastname
English, French, German, Dutch, Spanish (TobÃas), Hungarian (Tóbiás), and Jewish
English, French, German, Dutch, Spanish (TobÃas), Hungarian (Tóbiás), and Jewish : from a Greek form of the Hebrew male personal name TÅvyÄh ‘Jehovah is good’, which, together with various derivative forms, has been popular among Jews for generations.
Girl/Female
English American German
Worldly. Earth, from the Old English eorthe. Famous bearer: American creole singer Eartha Kitt.
Boy/Male
Hindu, Indian
God
Boy/Male
Muslim
Adorer, Lover, Suitor
COPYLEFT
COPYLEFT
COPYLEFT
COPYLEFT
COPYLEFT