genesis is available under a dual licensing model. One license type is for commercial (english version) use, the other one for private and scientific (english version) use.
The use of the library is free of charge in any case, but there are limitations to the redistribution of the library by itself. There are no limitations to using genesis incorporated into another product.
At the moment the license texts are available in German and English.
If you have any questions or if you have specific needs just contact us via firstname.lastname@example.org or post at our forums at http://seadex.de/forums.
The licenses are also available as PDF in our downloads section.