Hence, the argument for open source cannot just rely on "please"; it must also be accompanied by the "hard power" of giving access to some code only to those who open up theirs.
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Why I used to prefer permissive licenses and now favor copyleft
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Vitalik Buterin believes voluntary sharing is no longer sufficient and that copyleft provides the “hard power” needed to enforce openness by requiring reciprocal sharing of code
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