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Sure. Only the new contributions are under the new license the older contributions are not affected at all. The follow-up question would be what allows them to

Sure. Only the new contributions are under the new license the older contributions are not affected at all. The follow-up question would be what allows them to still use the old contributions together with the new proprietary ones and the answer is: the permissive license of the old contributions. If the old contributors have not wanted that, they should not have contributed to a project under a permissive license.

kelnos 3y ago
To be clear (for the GP and others): the consequence of the parent's second paragraph is that if the old license were something like the GPL, this wouldn't be allowed, unless all copyright holders consented to the change. (The GPL specifically does not allow "adding restrictions", which the new licenses do.) But since the old license is BSD/MIT (I think?), it's fine. BSD/MIT code is still licensed as such, but can be commingled with code under the new licenses without issues. BSD/MIT's terms can still be complied with under the new licenses.