I saw this the other day:
Sunset Seedless grape package
and I’ve been thinking about the implications… is it really possible to add this type of condition? I think I agree with Madisonian’s evaluation of the situation, assuming that the grapes are patented. But what if they’re not patented? Can you restrict usage of a purchased good? Thoughts would be appreciated. 🙂
From boingboing.
LicensingHandbook Archive 
The patent is intended to keep people from propogating the variety and selling it as their own. It is extremely easy to propogate new vines from stolen wood so this patent insures that Sunview Marketing can only sell Sunset Seedless