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29 Apr 15
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Copyleft
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17 Apr 15
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Copyleft (a play on the word copyright) is the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work. In other words, copyleft is a general method for making a creative work as freely available to be modified, and requiring all modified and extended versions of the creative work to be free as well.[1]
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In general, copyright law is used by an author to prohibit recipients from reproducing, adapting, or distributing copies of the work. In contrast, under copyleft, an author may give every person who receives a copy of a work permission to reproduce, adapt or distribute it and require that any resulting copies or adaptations are also bound by the same licensing agreement.
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Copyleft licenses (for software) require that information necessary for reproducing and modifying the work must be made available to recipients of the executable. The source code files will usually contain a copy of the license terms and acknowledge the author(s).
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Copyleft type licenses are a novel use of existing copyright law to ensure a work remains freely available. The GNU General Public License, originally written by Richard Stallman, was the first copyleft license to see extensive use, and continues to dominate the licensing of copylefted software.
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25 Mar 15
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An early use of the word "copyleft" was in Li-Chen Wang's Palo Alto Tiny BASIC's distribution notice "@COPYLEFT ALL WRONGS RESERVED" in June 1976, but Tiny BASIC was not distributed under any form of copyleft distribution terms, so the wordplay is the only similarity.[7][8]
The concept of copyleft was described in Richard Stallman's GNU Manifesto in 1985 where he wrote:
GNU is not in the public domain. Everyone will be permitted to modify and redistribute GNU, but no distributor will be allowed to restrict its further redistribution. That is to say, proprietary modifications will not be allowed. I want to make sure that all versions of GNU remain free.
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04 Mar 15
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03 Dec 14
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Copyleft (a play on the word copyright) is the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work. In other words, copyleft is a general method for making a creative work as freely available to be modified, and requiring all modified and extended versions of the creative work to be free as well.[1]
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29 Nov 14
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16 May 14
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09 Nov 13
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to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work.
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marking a creative work as freely available to be modified, and requiring all modified and extended versions of the program to be free as well
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Copyleft is a form of licensing and can be used to maintain copyright conditions for works such as computer software, documents, and art.
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same licensing agreement.
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04 Oct 13
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Popular copyleft licenses, such as the GPL, have a clause allowing components to interact with non-copyleft components as long as the communication is abstract, such as executing a command-line tool with a set of switches or interacting with a Web server.[29] As a consequence, even if one module of an otherwise non-copyleft product is placed under the GPL, it may still be legal for other components to communicate with it normally
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03 Oct 13
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Copyleft
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to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work.
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to offer the right
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method for marking a creative work as freely available to be modified, and requiring all modified and extended versions of the program to be free as well
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form of licensing
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copyright law is used by an author to prohibit recipients from reproducing, adapting, or distributing copies of the work
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under copyleft, an author may give every person who receives a copy of a work permission to reproduce, adapt or distribute it and require that any resulting copies or adaptations are also bound by the same licensing agreement.
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Copyleft can be characterized as a copyright licensing scheme in which an author surrenders some, but not all rights under copyright law.
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the goal of copyleft is to give all users of the software the freedom to carry out these activities.
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30 Sep 13
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28 Jul 13
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requiring all modified and extended versions of the program to be free as well
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freely available to be modified
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not necessarily mean free of charge (gratis)
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17 Mar 13
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Copyleft is a form of licensing and can be used to maintain copyright conditions for works such as computer software, documents, and art. In general, copyright law is used by an author to prohibit others from reproducing, adapting, or distributing copies of the author's work. In contrast, under copyleft, an author may give every person who receives a copy of a work permission to reproduce, adapt or distribute it and require that any resulting copies or adaptations are also bound by the same licensing agreement.
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Copyleft type licenses are a novel use of existing copyright law to ensure a work remains freely available. The GNU General Public License, originally written by Richard Stallman, was the first copyleft license to see extensive use, and continues to dominate the licensing of copylefted software. Creative Commons, a non-profit organization founded by Lawrence Lessig, provides a similar license provision condition called ShareAlike
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16 Nov 12
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25 Oct 12
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describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work.
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general method for making a program (or other work) free (libre), and requiring all modified and extended versions of the program to be free as well.
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free as in freely available to be modified.
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copyright law is used by an author to prohibit others from reproducing, adapting, or distributing copies of the author's work. In contrast, under copyleft, an author may give every person who receives a copy of a work permission to reproduce, adapt or distribute it and require that any resulting copies or adaptations are also bound by the same licensing agreement.
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GNU General Public License, originally written by Richard Stallman, was the first copyleft license to see extensive use
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Copyleft can be characterized as a copyright licensing scheme in which an author surrenders some but not all rights under copyright law.
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one benefits freely from the work of others but any modifications one makes must be released under compatible terms.
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goal of copyleft is to give all users of the software the freedom to carry out these activities.
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01 Oct 12
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21 Sep 12
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Copyleft is a play on the word copyright to describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work
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19 Jul 12
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23 Apr 12
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These freedoms do not ensure that a derivative work will be distributed under the same liberal terms. In order for the work to be truly copyleft, the license has to ensure that the author of a derived work can only distribute such works under the same or equivalent license.
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Copyleft is a distinguishing feature of some free software licenses
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Many free software licenses are not copyleft licenses because they do not require the licensee to distribute derivative works under the same license.
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16 Apr 12
johny questcopyleft
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27 Jan 12
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Copyleft is a play on the word copyright to describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work. In other words, copyleft is a general method for making a program (or other work) free (libre), and requiring all modified and extended versions of the program to be free as well.[1]
Copyleft is a form of licensing and can be used to maintain copyright conditions for works such as computer software, documents and art. In general, copyright law is used by an author to prohibit others from reproducing, adapting, or distributing copies of the author's work. In contrast, under copyleft, an author may give every person who receives a copy of a work permission to reproduce, adapt or distribute it and require that any resulting copies or adaptations are also bound by the same licensing agreement.
Copyleft licenses (for software) require that information necessary for reproducing and modifying the work must be made available to recipients of the executable. The source code files will usually contain a copy of the license terms and acknowledge the author(s).
Copyleft type licenses are a novel use of existing copyright law to ensure a work remains freely available. The GNU General Public License, originally written by Richard Stallman, was the first copyleft license to see extensive use, and continues to dominate the licensing of copylefted software. Creative Commons, a non-profit organization founded by Lawrence Lessig, provides a similar license called ShareAlike.
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26 Jan 12
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05 Dec 11
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27 Nov 11
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28 Sep 11
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01 Jun 11
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15 Feb 11
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07 Feb 11
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Copyleft is a play on the word copyright to describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work. In other words, copyleft is a general method for making a program (or other work) free, and requiring all modified and extended versions of the program to be free as well.[1]
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21 Jan 11
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16 Dec 10
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18 Jul 10
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29 May 10
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09 Apr 10
Michael LapidesCopyleft is a play on the word copyright to describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work.
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16 Feb 10
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10 Jan 10
Morgaine LeFayeCopyleft is a play on the word copyright to describe the practice of using copyright law to remove restrictions on distributing copies and modified versions of a work for others and requiring that the same freedoms be preserved in modified versions. Copyl
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02 Nov 09
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an author may, through a copyleft licensing scheme, give every person who receives a copy of a work permission to reproduce, adapt or distribute the work as long as any resulting copies or adaptations are also bound by the same copyleft licensing scheme.
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A widely used and originating copyleft license is the GNU General Public License. Creative Commons provides a similar license called ShareAlike.
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copyleft allows an author to impose some, but not all, copyright restrictions on those who want to engage in activities that would otherwise be considered copyright infringement.
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In software, open source copyleft licenses place the primary restriction that information helpful in supporting modification of software (e.g. source code) must be made available to a user with a copy of the licensed software and allows the original author to be acknowledged.
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02 Oct 09
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28 Sep 09
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02 Sep 08
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19 Aug 08
Jem Fleming"Copyleft is a play on the word copyright to describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work.. and can be
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09 Aug 08
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26 Mar 08
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14 Mar 08
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29 Feb 08
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Under copyleft, copyright infringement may be avoided if the would-be infringer perpetuates the same copyleft scheme. For this reason copyleft licenses are also known as viral or reciprocal licenses.
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in most European countries it is not permitted for a software distributor to waive all warranties regarding a sold product. For this reason the extent of such warranties are specified in most European copyleft licenses. Regarding that, see the CeCILL license, a license that allows one to use GNU GPL (see article 5.3.4 of CeCILL) in combination with a limited warranty (see article 9 of CeCILL).
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he created his own copyright license, the Emacs General Public License > [3] > , the first copyleft license. > This later evolved into the GNU General Public License
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when Richard Stallman was working on a Lisp interpreter. Symbolics asked to use the Lisp interpreter, and Stallman agreed to supply them with a public domain version of his work. Symbolics extended and improved the Lisp interpreter, but when Stallman wanted access to the improvements that Symbolics had made to his interpreter, Symbolics refused. Stallman then, in 1984, proceeded to work towards eradicating this emerging behavior and culture of proprietary software, which he named software hoarding.[2]
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02 Feb 08
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24 Dec 07
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02 Jun 07
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23 Nov 06
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05 Jan 06
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Where copyright law is seen by the original proponents of copyleft as a way to restrict the right to make and redistribute copies of a particular work, a copyleft license uses copyright law in order to ensure that every person who receives a copy or derived version of a work, can use, modify, and also redistribute both the work, and derived versions of the work. Thus, in a non-legal sense, copyleft is the opposite of copyright.
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Where copyright law is seen by the original proponents of copyleft as a way to restrict the right to make and redistribute copies of a particular work, a copyleft license uses copyright law in order to ensure that every person who receives a copy or derived version of a work, can use, modify, and also redistribute both the work, and derived versions of the work. Thus, in a non-legal sense, copyleft is the opposite of copyright.
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09 Nov 05
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30 Mar 05
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22 Mar 05
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