I remember some time ago a discussion somewhere on the boards that some unscrupulous people might in theory "add" a phantom person onto their reservation, thereby gaining more meals for the cost of a one-day ticket. Thankfully Disney seems to have consisdered this possibility. We made a slight change to our reservation and I just received the confirmation in the mail. There is a new line added, which was not on our original confirmation: "Please note: Your reservation includes Disney Dining Plan components. In order to claim these components, all members of your party must be present at check-in or your reservation will be modified." Go Disney!