Aptana uses a "dual licensing" model. Under this model, users may choose to use Aptana Studio under the free software/open source GNU General Public License (commonly known as the "GPL") or under the Aptana Public License (known as the "APL"). We may be willing to enter into other commercial licensing arrangements on a case-by-case basis.
Under the GPL license, Aptana Studio is available free of charge, as long as the use of Aptana Studio adheres to the terms of the GPL license. Users may download the software for free, and modify, integrate and distribute it. However, GPL users must abide by the rules of the GPL, which stipulate that if a work based on Aptana Studio is redistributed, the complete source code for this work must also be open and available for redistribution under the terms of the GPL. See the GPL and the FAQ of the Free Software Foundation (http://www.gnu.org/licenses/gpl-faq.html) for more details.
Aptana offers the APL license for organizations that want to use Aptana Studio free of charge and modify, integrate and distribute it for personal or internal
use only, without any redistribution requirements. If you want to make a commercial use of Aptana Studio, you must do so as part of an open source project, under the GPL, or under other commercial license terms we may agree to.