FineDB uses some external libraries, which are all open-sourced in a way that is compatible with FineDB's own license.
LightningDB
LMDB is licensed under the OpenLDAP Public License.
Nanomsg
Nanomsg is licensed under MIT/X11 license.
Snappy
Snappy is placed under the BSD 3-clause license.
Linenoise
Linenoise is licensed under the terms of a permissive BSD-derived license.
Ylib
Ylib is licensed under the terms of the GNU Lesser General Public License.