"Copyleft" is the term used to refer mainly to free licenses.
We understand by copyleft a license that allows -apart from a greater control of creators in their works, research and projects and a more reasonable compensatory remuneration for their work- end users to better access and enjoy a property under such as as unrestricted license.
The Copyleft Foundationdefined copyleft as "a licensing group which aims to ensure that every person who receives a copy of a work may in turn use, modify and redistribute their work and derived versions of same. Sometimes it allows commercial use of this work and sometimes not, depending on what rights the author wants to give. "
Here are some types of copyleft licenses:
- Creative Commons
Creative Commons is an international non-profit organization that offers a range of licenses ranging from the traditional copyright system to the public domain. With Creative Commons licenses authors authorizes the use of their work, but the work continues to be protected.
The system works as follows: authors who create a work and want to exploit it via the Internet, choose a Creative Commons license and when their work is put on the Internet, they are identified with the Creative Commons and a license attached. Thus, when users access the document, they can easily identify which are the conditions that the author has established for the use of the work.
Its main objective is to suplement the existing system of copyright, and for that purpose, six licenses have been developed, based on four basic conditions: recognition (attribution), non-marketing (non commercial), not creating derivative works (non derivate works) and sharing the same ( share alike).
There are six different licensing models:
Attribution: the author may copy, reproduce, distribute, transmit the work, make derivative works (translation, adaptation, etc.). and make it a commercial use, provided the original author is acknowledged and recognized.
Attribution - NoDerivatives: the author may copy, reproduce, distribute, perform the work and make a commercial use of it, provided you cite and acknowledge the original author. It is not allowed, however, to create a derivative work of it.
Attribution - NonCommercial - NoDerivatives: the author may copy, reproduce, distribute and transmit the work, provided you cite and acknowledge the original author. Not allowed, however, to create a derivative work of it or use it for commercial purposes.
Attribution - NonCommercial : the author may copy, reproduce, distribute, and transmit the work or create derivative works, provided you cite and acknowledge the original author. It is forbidden, however, to use the work for commercial purposes.
Attribution - NonCommercial - ShareAlike : in addition to the foregoing license permits, it allows the distribution of derivative works, but solely and exclusively licensed by the same type as this one.
Attribution - ShareAlike : the author may copy, reproduce, distribute, transmit the work, do derivative work and make it a commercial use, provided you cite and acknowledge the original author. In addition to these permissions, it allows the distribution of derivative works, but solely and exclusively licensed by the same type as this one.
All Creative Commons licenses require the recognition of the author of the work and, if the author wants, you must also indicate the source (eg, institution, publication or magazine) in which it has been published.
These licenses are valid in perpetuity, ie the duration of the protection of the work. The author reserves the right at any time, to exploit the work to another license (Creative Commons is not), or even remove it, but the license previously granted will remain valid. Creative Commons licenses are non-exclusive, so the author can grant other licenses for the same work with different conditions, but subsequent licenses may be granted only on a non exclusive basis.
The project Creative Commons Spain was associated with this project almost from the start. Today the licenses are fully translated and adapted to Spanish law since October 1, 2004. The Creative Commons affiliate of Spain is the University of Barcelona (UB)
ColorIURIS is a system that was born in Zaragoza in 2005 developed by lawyer Pedro Canut.
It is defined as "a mixed system of self-management and sale of copyrighted material online from the continental model" with legal effects on creators of 25 countries , among which is Spain.
Combining legal tools and web tools for copyright holders to register their digital content and manage their copyrights (free or paid) within and outside the network, with international legal certainty.
ColorIURIS is for content creators (literary, musical, audiovisual and photographic) using the World Wide Web for dissemination, publication and/or made available who want to relinquish the rights of their creations in and outside the network.
ColorIURIS provides authors with different possibilities of using the licensing agreements (contracts), at the option of the holders of rights based on that which is hosted content .
Colors play an essential role in ColorIURIS, and that through a code of colors including red, yellow, green and blue informs the visitor of a website copyright policy that has set by the owner.
The meaning of the colors not only depends on the pitch, but also of their situation.
If you want more information and select the one you most want to visit the official website of ColorIURIS
The FSF (Free Software Foundation) maintains and defends the GNU General Public License.
It is aimed primarily at protecting the free distribution, modification and use of software and is used by most GNU programs and more than half of the free software packages. The latest version is 3.
Its purpose is to declare that the software covered by this license is free software and protect from attempts to take that restrict those freedoms to users
Apart from the FSF also is responsible for the Public License GNU Lesser General (GNU LGPL), the License GNU free documentation (GNU FDL) and Affero General Public License GNU.
You can find more information on the official website of GNU