It sounds like legal gibberish to me as well, but here's my best guess: * Contracts may have some cancellation period associated with them. You and I have ent

It sounds like legal gibberish to me as well, but here's my best guess: * Contracts may have some cancellation period associated with them. You and I have entered a contract where I renovate your kitchen, and in exchange you pay me. I have you on the calendar in three months. If you change your mind in the next month, you can cancel the contract at no penalty. * Two weeks later, I call you back and ask if you'd like me to start immediately. Somebody else canceled, and I have an opening in the schedule. You agree, and so I start the renovations. * Another week passes, and the renovations are complete. But we're only three weeks into the original month-long cancelation period, so you slyly say that you'd like to cancel with no penalty. I could say that since I had begun the performance of my obligations, the cancellation period ended early. So, I can understand where the concepts would come in. What makes no sense whatsoever is to have a cancellation period that ends at the same moment that the cancellation period starts. In the example, the cancellation period ended based on a follow-up choice. In Nintendo's wording, it seems like an attempt to negate any cancellation period whatsoever, because it would be created and dismissed within the same contract.