Is there an open source license for ExtJS?
Ext JS comes with a dual license: So yes, if you open source your application with a license compatible with the GNU GPL license v3. 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.
Can a GPL program run on anyone else’s computer?
That code runs on your computer, nobody else’s. Since the GPL code doesn’t execute on anyone else’s machine, they cannot demand to see the source for the running program, even if it was modified.
Can a closed source application be open source?
If I create a closed source application which uses some GPL licensed libraries but don’t actually distribute the software, only its output, can I keep the software closed sourced? Specifically, I am talking about a biological data analysis pipeline. Internally, our software will be using some GPL libraries to generate its output.
Do you need ExtJS for server side code?
Presumably, you won’t need any of Sencha’s ExtJS code for the services that you are putting together. So their license restrictions won’t have an impact upon your server side code. Even if you did use their code within your server’s services, the GPL “loophole” (as you called it) means you don’t need to distribute your server side source code.
Is it legal to redistribute ExtJS to end users?
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.
Can you use GPLv3 with ExtJS SDK?
“Could we first use GPLv3 to try the ExtJS for learning and training privately in company, and use Commercial license when we decide to release software and begin to charge?” Not according to Sencha’s own commercial license. See this section of http://www.sencha.com/legal/sencha-sdk-software-license-agreement