The Standard Edition of the DHTMLX products is distributed under GNU GPL v2, which means you can download and use it in a GPL-licensed project for free. To use the Standard Edition in a non-GPL/proprietary project, you need to buy a Commercial or Enterprise license.
NOTE: DHTMLX Toolbar, Accordion, ColorPicker, Slider, Ajax, Popup, Message, and Editor components, as well as DHTMLX Touch 1.2, are available under a free license. You can use them for free in commercial apps.
There is a PRO Edition for some of DHTMLX products (Suite, Vault, Scheduler, etc.). The PRO Edition includes some additional features and is distributed under Commercial and/or Enterprise licenses. By purchasing a license, you get access to our customer support system. Learn more about licensing details.