Copyleft

To ensure the availability of free software and new derivative programs, the so-called Copyleft has been created. They say it is not opposed to the famous copyleft copyright, but is a parallel concept. Since there is copyleft, if someone takes a free program, he fixes it his way and sells it as normal software, that is, if he hides the source code, he will not only oppose those who have worked before, but also the law.

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