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Linus [Torvalds] also adopted the standard GNU licensing scheme called Copyleft. The general public license, or GPL, allows users to sell, copy, and change Copylefted programs – which can also be copyrighted – but you must pass along the same freedom to s

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Linus [Torvalds] also adopted the standard GNU licensing scheme called Copyleft. The general public license, or GPL, allows users to sell, copy, and change Copylefted programs – which can also be copyrighted – but you must pass along the same freedom to sell or copy your modifications and change them further. You must also make the source code of your modifications freely available.

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