It is my understanding that if you purchase directly from
DVC, then you can use your points anywhere, but when you resell your contract, if you ever do, then the new buyer can only use the points at the home resort. This restriction, lowers the value of the points in the resale market, but interestingly, if you have a contract without the new restriction, then the value of that contract should go up, all other things being equal. If you purchase an old contract on the resale market, then the contract is not restricted and you can use the points at any location.