General Public License (GPL ). Like other free software licenses, GPL permits the public the freedom to run and copy software, the freedom to distribute and Disseminate software, and the freedom to obtain the source code of software, and the freedom to improve the software and distribute the improved version to the society. GPL also stipulates that as long as the overall or part of the modified text comes from ProgramThe overall modification text must be circulated according to GPL. Not only must the source code of the modified text be disclosed to the public, but restrictions made by the modifier cannot be attached to the circulation of the modified text. Therefore, programs that follow GPL circulation cannot be merged with non-free software. This circulation rule expressed by GPL is called Copyleft, indicating that it is "Opposite" to the copyright concept ".
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