As part of the relicensing ZeroMQ did a few years ago, they sought permission from all previous contributors (yes, it was a multi-year effort). Code contributio

As part of the relicensing ZeroMQ did a few years ago, they sought permission from all previous contributors (yes, it was a multi-year effort). Code contributions that they weren’t able to get permission to relicense resulting in the corresponding lines being removed (or functionality rewritten from scratch).