Copyleft

Copyleft

A concept extended by the http://www.aliyun.com/zixun/aggregation/29607.html "> Free Software Movement" is a common method of turning a program into a free software, which has been translated into "right" Take up the meaning of insufficient copyright. The choice of copyleft authorization does not mean that the author abandons the copyright, in addition to allowing the authorized person to use, distribute, modify, the copyleft clause requires that the modified derivative works should be given the same authorization way to repay the community, which is copyleft different from the traditional public domain characteristics. The idea of copyleft is the GNU program, which is included in the GNU General Public License Agreement, the GNU wide general Public License and the GNU Free Document License agreement.

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