Copyright is a legal concept, which grants the author or creator of a work legal rights to control the duplication and public performance of his or her work. In many jurisdictions, this is limited by a time period after which the works then enter the public domain. During the time period of copyright the author's work may only be copied, modified, or publicly performed with the consent of the author, unless the use is a fair use. Traditional copyright control, limits the use of the work of the author to those who can, or are willing to, afford the payment of royalties to the author for usage of the authors content, or limit their use to fair use. Secondly it limits the use of content whose author cannot be found.^[4] Finally it creates a perceived barrier between authors by limiting derivative works, such as mashups and collaborative content^[5]