[the_precipitate]

My understanding is that they have a common layer over which they hold full copyright, so they can license it however they like. But since this software is also used in EloqSQL (which includes MariaDB code) and EloqDoc (which includes MongoDB code), the license has to be compatible with both. That’s why they state that the code can be licensed under either license (note the OR part).

I doubt they would accept any code that cannot be re-licensed, because the common layer essentially “transmits the infection,” for lack of a better way to describe it.