A copyfraud is a false copyright claim by an individual or institution with respect to content that is in the public domain. Such claims are unlawful, at least under US and Australian copyright law, because material that is not copyrighted is free for all to use, modify and reproduce. Copyfraud also includes overreaching claims by publishers, museums and others, as where a legitimate copyright owner knowingly, or with constructive knowledge, claims rights beyond what the law allows. The term copyfraud was coined by Jason Mazzone, a Professor of Law at the University of Illinois. Because copyfraud carries little or no oversight by authorities and few legal consequences, it exists on a massive scale, with millions of works in the public domain falsely labelled as copyrighted. Payments are therefore unnecessarily made by businesses and individuals for licensing fees. Mazzone states that copyfraud stifles valid reproduction of free material, discourages innovation and undermines free speech rights. Other legal scholars have suggested public and private remedies, and a few cases have been brought involving copyfraud. Mazzone describes copyfraud as: Claiming copyright ownership of public domain material. Imposition by a copyright owner of restrictions beyond what the law allows. Claiming copyright ownership on the basis of ownership of copies or archives. Attaching copyright notices to a public domain work converted to a different medium. According to copyright experts Jason Mazzone and Stephen Fishman, a massive amount of works in the public domain are reprinted and sold by large publishers that state or imply they own copyrights in those works. While selling copies of public domain works is legal, claiming or implying ownership of a copyright in those works can amount to fraud. Mazzone notes that although the US government protects copyrights, it offers little protection to works in the public domain. Consequently, false claims of copyright over public domain works (copyfraud) is common.