Once a work is distributed under a CC licence, this can practically no longer be reversed. In legal terms, all licence agreements would have to be cancelled with the consent of every person who has received a copy. The very task of finding everyone who owns a copy – on the Internet in particular – would be almost impossible. If there is only one copy of a work with a CC licence in circulation, there is a possibility that this work will be redistributed (e.g. sold or given away). Due to the CC licence, the recipients of this redistributed copy of the work receive the right to redistribute a copy of the work, etc. However, authors can also distribute their work under another licence than the CC licence or under different CC licences at the same time.