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Copyleft licenses are not “restrictive”
(drewdevault.com)
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That's fair, I suppose - but going back to the word restrictive, you could also frame the requirement for attribution as a "restriction."
DeVault suggests the term "reciprocal" at the end of his post. Another term often used is "share-alike." Both of these terms, I think, more accurately hint at the exact conditions of the grant without negatively framing it as a "restriction."