ExtJS 4 - Licensing

ExtJS 4 Licensing

Before we start reading, experimenting and learning any new technologies, its always worth to understand the product or technologies licensing terms, this is actually where you can figure out, if you are violating
any contractual term or infringing any copy or patent rights.

This can be extremely benefited, when you actually start making money from the technology or from third party open source components.

Before baseline my project architecture, I started exploring its licensing terms, to uncover, any vendor locking or any infringements by the use of extjs libraries in my project.

I browsed a lots of content of extjs licensing over the internet, and finally concluded as follows

ExtJS 4 released under dual licensing terms,

1)     Commercial software license ( this is the case, when you planning to start product and including its libraries, which would force you to pay some annual fee to Secha)

2)      Open source license ( this is for any one who is using extjs libraries to exhibit its features and not to modify, and to let end user to use. For this we don’t need to pay any thing as long as we make freely available our source code which uses the library)

As I am much into open source technologies, to not to conflict my first priority is to look for open source product with no licensing complexities or propogations.

Sencha allow every one to use ExtJs 4 under the terms of GNU GPL license v3.

Hope above information is useful, your comments are welcome to share more knowledge on the knowledge-pages. Thanks