If you are creating your own software developer kit (SDK), web application builder or website builder based on Sencha Ext JS, Sencha GXT, or Sencha Touch, then you need an OEM agreement with Sencha. Please read the license agreement under the Prohibited Use for more information on when an OEM is needed since use cases vary widely, commercial OEM licenses are customized per customer. Contact us to learn more about this option. Full license details are available in our Legal section.