Something to know about licensing and launching commercial script

[eluser]Unknown[/eluser]
Hello dear members,

I am here to know something about this framework. I am thinking to launch a commercial script and for which I want to hire codeignier developer to develop that script for me. But can I use codeigniter and develop a commercial script for sale? OR do I need to buy a license for this from codeignier?

I mean is this free for use to a paid script?

Thanks a lot.