So, let's begin with Ext JS! The first thing we should do is download the framework from the official website, http://www.sencha.com/products/extjs/. The version available at the time of writing this book is 5.1.1.
The commercial license: You need to buy this if you are planning/wanting to develop a closed source project and want to keep the source code as your own property. Usually used by corporations, banks, or enterprises.
The commercial OEM: If you want to use Ext JS to create your own commercial SDK or web application ...
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