Cito direttamente dal sito di skype. Accettando la licenza d'uso di skype, si accetta anche questo:
What Resources Do We Use and How Do We Use Them?
During the course of using Skype Software, disk space, bandwidth and processing power may be utilized to provide the Skype services to you and to communicate with other Skype users. From time-to-time your computer may become a Supernode. A Supernode is a computer running Skype Software that has been automatically elevated to act as a hub. Supernodes may assist in helping other users to communicate or use the Skype software efficiently. This may include the ability for your computer to help anonymously and securely facilitate communications between other users of the Skype Software who, due to network and firewall constraints, cannot establish direct connections. The system has been designed so that being a Supernode will not interfere with the normal operations of your computer.