The license under which the Pods Framework software is released is the GPLv2 (or later) from the Free Software Foundation. A copy of the license is included with every copy of Pods Framework, but you can also read the text of the license here.
Part of this license outlines requirements for derivative works, such as plugins or components. Derivatives of Pods Framework code inherit the GPL license. Drupal, which has the same GPL license as the Pods Framework, has an excellent page on licensing as it applies to themes and modules (their word for plugins). Further, we have adopted the same policies and license as outlined by WordPress.