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Copyleft licenses are not “restrictive”
(drewdevault.com)
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this post was submitted on 02 May 2024
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Conditional, as in you are free to incorporate the GPL code into your work on the condition that you preserve the freedoms downstream. By default you have no rights to distribute; the GPL does not take anything away, but it grants conditional rights. A restrictive license, like your proprietary EULA, would take away rights that the user would normally have.
Whether or not proprietary EULA's are enforceable is a matter of dispute; see Software user's rights (D. J. Bernstein). Regardless, as Bernstein notes, this default set of rights does not include distribution, which is governed by copyright law. Free software licenses such as the GPL are copyright licenses and grant limited rights of distribution. Note that even most "permissive" licenses are by definition conditional as they include at least the requirement for attribution.
You do realize the whole discussion is about what terms to use for differentiating between GPL-like "restrictive" licenses and BSD-like "permissive" ones? Saying that both are "conditional" really doesn't help anyone.
(also "by definition" the license's grants may be "conditional", not the license itself - it's not as if it looses validity under some condition)
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."