We're currently dealing with lawyers, and they spotted the following discrepancy:

The mongo-ruby-driver is apparently Apache licensed:
http://github.com/mongodb/mongo-ruby-driver/blob/master/LICENSE.txt

But this file is GPLv3/Affero licensed according to the copyright notice in the file:
http://github.com/mongodb/mongo-ruby-driver/blob/master/lib/bson/bson_ruby.rb

And so GPL trumps Apache and the entire driver is GPL, and so is any code using it (according to what we are being told).

Is bson_ruby.rb intentionally GPLv3d?