fastavro is a derivative work of Apache AVRO, below is the original NOTICE.txt
from the Apache Avro (http://svn.apache.org/viewvc/avro/trunk)

------------------------------------------------------------
Apache Avro
Copyright 2010 The Apache Software Foundation

This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).

C JSON parsing provided by Jansson and
written by Petri Lehtinen. The original software is
available from http://www.digip.org/jansson/.
------------------------------------------------------------