On 9 April 2017 at 09:30, Niall Douglas via Boost
If copyright weren't a problem, I'd suggest the Apache 2.0 licence which gives stronger guarantees to the end user (a Boost library doesn't actually have to have the Boost licence, it's just strongly recommended). But you don't own the copyright to the entire library.
The library only has NumScale copyright notices, so they claim ownership of the library, and could re-license it. AFAIK the Boost Software License requires keeping the copyright notices of any work it is derived from, so this is a violation of the BSL. Boost.SIMD is derived from the NT2 library which was a BSL-licensed collaboration between various parties. I warned NumScale about this a few years ago, but they dismissed it.