US Court of Appeals ruled that that Dakota as well as other companies, "Do not include the power to control a purchaser's subsequent disposition of the purchased copy". you can do what you want with the designs after you have purchased and they are just trying scare tactics with saying you will be sued. this person in the link fought them and WON. read the court decision in this link.
http://www.ca8.uscourts.gov/opndir/06/08/053309P.pdf
http://www.ca8.uscourts.gov/opndir/06/08/053309P.pdf
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