1.0 One download purchase per one website
2.0 We OFFER free updates (within its version number) every time vBulletin update its version. So if you bought a 4 version, you will get updates all the time until 4.x.x end of life. (for eg:vb4.0.1 to vb4.2.2) Same goes for other version.
3.0 You may not redistribute the contents of the zip file without the explicit permission from sultantheme.com, meaning cannot resell, share or modify unless for the use of changing banner or logo or background for the skin
4.0 You agree not to use our product for porn, gambling or alcohol/drug addict website.
Above is only for pre-made vbulletin skins NOT custom skin.
For custom skin additional terms please read here: http://www.sultantheme.com/services/custom-forum-design/