https://www.sencha.com/legal/gpl/
Sencha Ext JS、Sencha Touch、Sencha GXT
http://cdn.sencha.com/ext/gpl/ext-6.2.0-gpl.zip
http://cdn.sencha.com/touch/gpl/sencha-touch-2.4.2-gpl.zip
http://cdn.sencha.com/gxt/gpl/gxt-4.0.0-gpl.zip