Xbox Live is a gaming service that allows users to connect and play games online. DDoS attacks are a type of attack in which a large number of computers are used to overwhelm an online service or site, causing it to crash or become unavailable. There is no definitive answer to this question as it depends on the specific laws of each country where you live. In some cases, it may be legal to do DDoS attacks on Xbox Live; in other cases, it may not be. It is important to consult with your local law enforcement officials before doing any damage control or security measures on your Xbox Live account.