copyleft


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copyleft

(legal)
/kop'ee-left/ (A play on "copyright") The copyright notice and General Public License applying to the works of the Free Software Foundation, granting reuse and reproduction rights to everyone.

Typically copyrights take away freedoms; copyleft preserves them. It is a legal instrument that requires those who pass on a program to include the rights to use, modify, and redistribute the code; the code and the freedoms become legally inseparable.

The copyleft used by the GNU Project combines a regular copyright notice and the "GNU General Public License" (GPL). The GPL is a copying license which basically says that you have the aforementioned freedoms. The license is included in each GNU source code distribution and manual.

See also General Public Virus.

copyleft

A requirement in the GNU GPL software license and other "free" software licenses that anyone who redistributes the software does so under the same license and also includes the source code. The "free" means free of restrictions (see free software). The copyleft clauses were written to support copyright laws, not eliminate them.

Strong Vs. Weak
A "strong copyleft" license, such as the GNU GPL license, applies to all derived works and software components in the package. A "weak copyleft" license, such as the GNU Lesser GPL, applies only to the original copylefted work.

Full Vs. Partial
"Full copyleft" means that all of the work may be modified, whereas "partial copyleft" restricts some parts of the work from being altered. See GNU General Public License and copyright.
References in periodicals archive ?
5) See Estrada Medina for a more sustained examination of the political implications of the citational practices and copyleft in Antigona Gonzalez.
The Attribution Share-Alike is closest in intent to the GNU copyleft, where anyone can modify and re-distribute the work, including commercially, so long as the author is credited and so long as no restrictions are placed on future users other than preventing proprietary hoarding.
Copyleft and free or open access are two responses to the problem of the legally enforced scarcity of public domain works and access to information--actions that restrict fair efforts in due diligence when assessing the provenance of works of art that are changing hands.
Berry, Copy, Rip, Burn: The Politics of Copyleft and Open Source, Pluto 2008.
Siguiendo esta idea deberiamos reparar en que la apertura de codigos, el copyleft o la produccion social comun pueden potenciar una dispersion de la propiedad y contribuir, asi, a apuntalar modos de produccion no basados en relaciones de dominacion.
Copyleft e uma clausula das licencas GPL (19), idealizada para se contrapor a copyright, onde o autor declara compartilhar seus direitos, sem abrir mao da propriedade, autorizando a utilizacao, modificacao e distribuicao do software por outras pessoas, respeitados os termos especificos da licenca.
De repente, surgian comunidades en red y proyectos comunitarios exitosos como la Wikipedia o el movimiento copyleft.
Mientras la imprenta y el negocio editorial asociado a ella dependen de una nocion central de autoria basada en el copyright, Internet se basa en la cultura hacker (Castells, Internet 41), centrada en el desarrollo y la distribucion de software libre o la matizacion de la propiedad intelectual y la autoria a traves de, por ejemplo, las licencias copyleft.
Los principios que inspiran el software libre, que se garantizan a traves del uso del copyleft, se alcanzan mediante la adopcion del sistema de licencia publica general, (Public General License/GPL) contenida en un clausulado que define los terminos y el alcance de las condiciones de distribucion y redistribucion del software libre (enunciado tambien como GNU--GPL (38)), licencia que forma parte de cada una de las distribuciones que se hace del codigo fuente de los programas de computador GNU.
Son sistemas derivados de la alternativa al Copyright, es decir, del CopyLeft.
Es el caso del proyecto Plus (Picture licensing universal system), en espanol Suli -Sistema universal de licencias para imagenesaplicable a todas las empresas del sector, los modelos royalty free, o licencias de derechos de autor copyleft mas flexibles, entre las que se encuentra el sistema Creative Commons.
Greenbaum examines this trigger in the context of semiconductor industry practice, analyzes the copyleft provisions of the GPL as applied to semiconductor cores, and advances a counterintuitive argument that the GPL may be read as extending to distributions of physical devices that include GPL-licensed material.