http://www.icyphoenix.com/viewtopic.php?f=1&t=4435&p=45879#p45879
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spydie
Wed 11 Nov, 2009 09:16

Re: Open Source CMS And Icy Phoenix
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Even if you use an Open-Source cms for a privat buissenes site. You´ve got to get in contact with the developer first and ask for pèrmission or pay a small license fee. 

Normaly that is´nt much. But if you don´t, you might get in trouble. 

It should be specified in the gnu license and in the readme that comes with your Open-source ware.