This is what is written in our "RocketTheme Licenses"
www.rockettheme.com/legal/license.php
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The RocketTheme Proprietary Use License (v1.3)
The RocketTheme Proprietary Use License is a GPL compatible license that pertains only to the images, cascading style sheets and JavaScript elements of RocketTheme Templates, Themes, Styles (Joomla, Drupal, WordPress, phpBB3, etc). produced by RocketTheme. As stated by the GPL version 2.0 license, These elements of product that are not compiled together but are sent independently of GPL code, and combined in a client's browser, do not have to be GPL themselves. These images, cascading style sheets and JavaScript elements are copyright RocketTheme and can be used and manipulated for your own or your clients purposes. You cannot redistribute these files as your own, or include them in a package or extension of your own without prior consent of RocketTheme. The use of these portions are bound to the number of entitlements your membership provides as well as the restrictions on distribution that the Terms of Service outline.