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There's a whole drama over it: lwn.net/Articles/47830 GPL proponents see Toybox as essentially an anti-GPL-enforcement project. The Toybox maintainer is the person who *started* the BusyBox GPL enforcement actions and then grew disillusioned with it. I find it quite amusing.
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GPL regularly gets in my way. GPLv2 (Linux kernel) is incompatible with the GPLv3 or later license used by GNU and most other copyleft supporting projects. GPL is why Linux doesn't have a proper mainline ZFS support. GPLv3 forbidding an immutable root of trust is problematic.
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It is the GPL at fault. GPL is similarly incompatible with MPL 1.0 in the same way for the same reason. It's incompatible with other licenses for similar reasons. Even if the talking point that Sun chose the license for that reason was true (doubtful), it's still GPL's fault.
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GPL is even largely incompatible with itself (GPL vs. AGPL, GPLv2 vs. GPLv3, etc.). Like most modern licenses, CDDL deals with patent grants, which is GPLv2 incompatible. Apache 2 is GPLv2 incompatible for the same reason. Per-file licensing is the issue shared with MPL 1.0.
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