Can this equation editor be used in commercial projects?

Hi! This equation editor is one of the best that i have come across.Now my question is, can this editor be used in commercial web projects?What i want to know is that , will i be charged fee for using this editor in my website?

Thanks for that, and this is only v3. Its going to get a lot better :)

As for costs. Please see: http://codecogs.izyba.com/latex/license.php

Also see the usage policy that covers free usage: http://codecogs.izyba.com/latex/usage.php