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I am a student and Translator in Salta, Argentina. Hire me.

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*It’s against the idea that knowledge is limited to private property of a small population.
*Forbidden to use the material for commercial purposes, cannot make a profit since it is free.
*If you are using someone else’s modified work, there is a risk to take because the information may not be accurate.
*If the author asks you to stop using the original copyrighted version, you must remove that it immediately.
*No technical support.
*Even if there is technical support, you may have to pay to fix the problem. Earn less profit if using copyleft.

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*It is cost-free to use a copyleft program.
*Copyleft provides free access to modified work.
*It encourages people to modify the work.
*It encourages people to reproduce their modified.
*It gives users freedom of expression.
*Freely available to anyone to use for any purpose, including studying, copying, modifying, extending and giving it away.

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The concept of copyleft was described in Richard Stallman's GNU Manifesto in 1985.
As Stallman deemed it impractical in the short term to eliminate current copyright law and the wrongs he perceived it perpetuated, he decided to work within the framework of existing law; in 1985, he created his own copyright license.

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In general, copyright law is used by an author to prohibit recipients from reproducing, adapting, or distributing copies of their work. In contrast, under copyleft, an author may give every person who receives a copy of the work permission to reproduce, adapt, or distribute it, with the accompanying requirement that any resulting copies or adaptations are also bound by the same licensing agreement.

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Copyleft is the idea and the specific stipulation when distributing software that the user will be able to copy it freely, examine and modify the source code, and redistribute the software to others (free or priced) as long as the redistributed software is also passed along with the copyleft stipulation. Copyleft is a form of licensing, and can be used to maintain copyright conditions for works ranging from computer software, to documents, to art.

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https://opensource.com/resources/what-is-copyleft

http://searchenterpriselinux.techtarget.com/definition/copyleft

https://en.wikipedia.org/wiki/Copyleft

http://www.linfo.org/copyleft.html

https://group4copyleft.wordpress.com/about/