It seems that the Ext team has updated it’s licensing terms to a more restrictive license. Paul Duncan has an excellent review of what changed and what it means to developers who are considering using it.
What this means for us on campus is that if you are going to use the Ext framework, be sure that you read the license fully before you begin your project, and make sure that your project wont conflict with Ext’s new licensing.
Really too bad, yet as always it has two sides. I can understand the developers, wanting to protect their intellectual property to a certain range, but on the other side they are limiting their own product to a way too small developer audience. How should a professional javascript coder rely on such a framework if he is not allowed to create tools ( also for commercial purposes ) with it?