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Ext JS license required for commercial
desktop applications built with Sencha Architect
Sencha Architect outputs code for desktop projects through the Sencha Ext JS framework. If you are developing commercial desktop applications with Sencha Architect, you need to purchase an Ext JS commercial license. Without an Ext JS commercial license, the output of any Sencha Architect project that uses Ext JS must comply with the GPL version 3 open source license (including the release of source code).
Read more about Ext JS licensing options