UnixCrypt License
['https://foss.heptapod.net/python-libs/passlib/-/blob/branch/stable/LICENSE#L70', 'https://opensource.apple.com/source/JBoss/JBoss-737/jboss-all/jetty/src/main/org/mortbay/util/UnixCrypt.java.auto.html', 'https://archive.eclipse.org/jetty/8.0.1.v20110908/xref/org/eclipse/jetty/http/security/UnixCrypt.html']