Free content, or free information, is any kind of functional work, artwork, or other creative content having no significant legal restriction relative to people's freedom to use, distribute copies, modify, and to distribute derived works of the content.[1] It is distinct from open content in that it can be modified, whereas one might not have that ability with content that is simply "open" and not "free".

Free content encompasses all works in the public domain and also those copyrighted works whose licenses honor and uphold the freedoms mentioned above. Because copyright law in most countries by default grants copyright holders monopolistic control over their creations, copyrighted content must be explicitly declared free, usually by the referencing or inclusion of licensing statements from within the work.

Though a work which is in the public domain because its copyright has expired is considered free, it can become non-free again if the copyright law changes.[2]

Traditionally, 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, when compared to free content, is limiting in several ways. It 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. Finally it creates a perceived barrier between authors by limiting derivative works, such as mashups and collaborative content. Copyleft is based on the belief that the temporary publishing monopoly that traditional copyright created in order to encourage science and learning is not actually the best way to promote science and learning.

The public domain is a range of creative works whose copyright has expired, or was never established; as well as ideas and facts[nb 1] which are ineligible for copyright. A public domain work is a work whose author has either relinquished to the public, or no longer can claim control over, the distribution and usage of the work. As such any person may manipulate, distribute, or otherwise utilize the work, without legal ramifications. A work released into the public domain, or under a very liberal license, by its author may be referred to as "copycenter.



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