THE answer to this is if you don't complete YOUR end by paying ALL the months, you haven't paid in FULL for the software. So there is NO reason why you should be able to keep it, if you pay monthly and LESS than 12 monthly payments. Simple as that. Why would they let you pay 10 months of payments, and then keep the full product? As many have tried to explain...it's NOT a rental...it's a contractual agreement.
If you don't finish paying the mortgage on your house, should the bank give you possession? You're NOT renting from the bank; you made a contractual agreement. Until the mortgage is paid off, you "technically" don't own the house, but in all practical purposes, you ARE the owner, being able to make ALL final decisions how the house is used, maintained, updated, decorated... (within the law, of course).
The fact that people STILL don't get this basic agreement, is almost mind boggling. Personally at this point, if I were Cakewalk, I'd basically stop trying to explain this to those that disagree with what is ACTUALLY presented and let them go their own way. It would just weed out all the idiots that potentially might use Sonar and the direct result might be that these forums are TOTALLY populated by informed, educated people, helping and solving problems in an informed, educated process. Trolls would then just become all that much more evident in their first few posts.