The server is shifting to a new proprietary license based on the AGPLv3
that is essentially a more aggressive, more viral version of the AGPLv3.
There are concerns in some places I've been reading like /. and HN that it
is so aggressive that it might bring in almost any SaaS that is built on
top of Mongo. People using the Java driver should be fine going forward,
but anyone using native APIs to access it could potentially be in serious