Is ExtJS open source? [closed]

问题:

Can we use extJS in a business application for free ?

回答1:

Can you use extJS for an business application for free?

Well, you can if any of the following statements are true.

• You open-source your app under GPL v3.
• The app is only for internal use in your company.
• The app is used by your company to provide a service and not directly distributed to the customer e.g. most web pages (according to GPL this is interpreted as an internal use of the app - if Ext team would have chosen to prohibit that, then they would have used Affero GPL, which directly forbids that).

回答2:

It's under the GPL and also available with a Commercial License. However, with the nature of Javascript, and the fact that it is always fetched by the browser before being executed may have made people think that by using ExtJS, they would be in effect redistributing the package and end up being required to distribute their own source under the GPL.

They have a license that specifically applies to Applications that make use of the library, and are not creating libraries based upon ExtJS:

http://www.extjs.com/products/floss-exception.php

"Open Source License Exception

This Exception is intended to be used for end-user applications and is not intended to be applied to software development libraries or toolkits ...

(d)the Derivative Work can reasonably be considered independent and separate work that is intended for use by end-users and not as a library for software development purposes."

So from my understanding of this, you can use ExtJS in a publicly available web application, and should also be able to create your own Javascript widgets based upon ExtJS as long as they are not being distributed on their own as a separate library.

回答3:

Ext JS comes with a dual license:

http://extjs.com/products/license.php

So yes, if you open source your application with a license compatible with the GNU GPL license v3.

回答4:

ExtJs has always had the dual license. However, the open source portion of the dual licence has become increasing restrictive as the product has progressed.

Version 2.0.2 was the last LGPL release. All subsequent releases (2.1 onwards) were released under GPL.

If you want to go with 2.0.2, it's pretty stable, but without some of the bells & whistles of later releases. You can get it here : http://yogurtearl.com/ext-2.0.2.zip

回答5:

ExtJS 4.0.2a is open source under GPL v3.0. You may fork and distribute the fork accordingly. Period. But beware.

Sencha does not accept source code contributions from third parties under the GPL license, but requires additional terms that allow them to remain the sole copyright holder. They do this in order to be able to change the license in the future. For one example, they currently distribute version Ext JS 4.0.6 to their paying customers only. For another, Apple demands a license other than the GPL for selling a program in the App Store, so Sencha wants to supply a different license to those using its products for iPhone apps.

So while you can make, use, and distribute a modified version under GPL terms, you will not have the right to merge Sencha's future work back into your fork of 4.0.2a, unless they opt to allow it. So far, since 4.0.2a, they do not.

回答6:

I would read the license aggrement.

You may not, without prior written consent of Ext JS, LLC, redistribute the Software or Modifications other than by including the Software or a portion thereof within Your own product, which must have substantially different functionality than the Software or Modifications and must not allow any third party to use the Software or Modifications, or any portions thereof, for software development purposes. You are explicitly not allowed to redistribute the Software or Modifications as part of any product that can be described as a development toolkit or library or is intended for use by software developers and not end-users. You are not allowed to redistribute any part of the Software documentation.

回答7:

ExtJS GPL Licence means that if you are using ExtJS under GPL Licence, and not modifying ExtJS itself, then you are Free to use ExtJS in whatever manner on any Website. But if you take ExtJS and start modifying ExtJS itself ( to make some better 'Super-Duper-ExtJS' Library ), then you have to share that with everyone, because if you start selling 'Super-Duper-ExtJS' to your Clients, then whats going to happen is that 'ExtJS-Company' finds itself Competing with Itself. I dont think you need to share your 'Website's Source-code' in any case. If you need to share your 'Websites source-code' ifself with other People while using ExtJS-GPL, then only the ExtJS-GPL Licence would start looking absurd, and you need to start looking at jQueryUI or DOJO ! But I dont think that 'ExtJS-Company' means to share your Websites-source just for the reason that you used their ExtJS Library ! What say .......