Forwarder license
This license allows forwarding (but not indexing) of unlimited data, and also enables security on the instance so that users must supply username and password to access it. (The free license can also be used to forward an unlimited amount of data, but has no security.)
Forwarder licenses are included with Splunk; you do not have to purchase them separately.
You can read about it here: http://docs.splunk.com/Documentation/Splunk/7.0.3/Admin/TypesofSplunklicenses#Forwarder_license
Forwarder license
This license allows forwarding (but not indexing) of unlimited data, and also enables security on the instance so that users must supply username and password to access it. (The free license can also be used to forward an unlimited amount of data, but has no security.)
Forwarder licenses are included with Splunk; you do not have to purchase them separately.