An anti-copyright notice is a specific statement that is added to a work in order to encourage wide distribution. Such notices are legally required because, under the Berne Convention in international copyright law, works are protected even if no copyright statement is attached to them. However, "anti-copyright" statements typically do not take the form of either sophisticated open content licenses or a simple dedication to the public domain; instead, they usually just encourage wide distribution. It is possible to denounce all claims to copyright in a work including moral rights in a written disclaimer.