He noted, “Historically, I was a fan of the permissive approach (eg. my blog is under the WTFPL). More recently, I am warming up to the copyleft approach.
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Vitalik Buterin rethinks open source licensing, calls for copyleft in competitive era
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Vitalik Buterin has shifted from favoring permissive licenses to supporting copyleft licenses like GPL and CC-BY-SA, which he sees as legal safeguards for openness by requiring shared source code in derivative works
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