You have purchased a boxed copy of Parallels desktop 4.0 or 5.0 for Mac in North America. However, the activation key is missing.
Our boxed product distributor, Nova Development, accidentally sent out a shipment of boxed product with the key code on a slip of paper instead of the sleeve.
Be sure to check the literature and packing within the box, in case the slip of paper was overlooked.
If you still fail to locate it, please kindly contact Parallels Customer Service directly:
http://www.parallels.com/support/request - > Customer Support and Licensing