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    ExtJS has an odd license. Either you pay the current maintainers, the Sencha Company to use it, or you must open-source all related code in your application. This is a show stopper for most companies. jQuery, on the other hand, uses the highly permissive MIT license. Commented Feb 18, 2012 at 17:00
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    Doesn't javascript automatically meet the requirements of open source? You serve the source to anyone viewing the page. Commented Apr 24, 2012 at 16:09
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    There's a difference between being able to view the source code and open source, which is defined by licensing. Commented Apr 26, 2012 at 21:59
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    you should have let the ExtJS rest in peace Commented May 14, 2020 at 14:23