source: https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;a=blob;f=NOTICE.txt;h=bd95322f254fc6f691b47e77df8c21229f47b8d4;hb=HEAD

Apache Log4j
Copyright 1999-2017 Apache Software Foundation

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

ResolverUtil.java
Copyright 2005-2006 Tim Fennell

Dumbster SMTP test server
Copyright 2004 Jason Paul Kitchen

TypeUtil.java
Copyright 2002-2012 Ramnivas Laddad, Juergen Hoeller, Chris Beams

picocli (http://picocli.info)
Copyright 2017 Remko Popma