[PieterH]

We use the LGPL license with a clause that makes it harmless. The MPLv2 license is not an issue. All complaints from businesses about licensing come straight to me, as they have for years. MPLv2 raises zero complaints.

ZeroMQ "memory leaks and timeouts" wasn't the issue. Do you have a reference for that?

Salt's issues with ZMTP were performance; they wanted to multicast securely, and ZMTP does not support that. I'd complain once again that making their own custom protocol (actually, it seems to be largely just CurveCP) rather than working with us to extend ZMTP was poor form. Also, Salt wanted a pure Python stack.