ARCHIVED: This Practice Note has been archived and is not maintained. This Practice Note was originally written for Lexis Practice Advisor®, in the US. It provides an overview of key US law copyright principles, including the types of works that are eligible for federal copyright protection, the requirements for copyright protection (originality and fixation), ownership, preemption of state law, the exclusive rights afforded to copyright owners under the Copyright Act,, limitations on copyright protection (e.g., functionality, fair use, the first-sale doctrine, compulsory licensing), enforcement, and remedies. What is a copyright? A copyright protects an original work of authorship that has been fixed in a tangible medium of expression (see: Requirements for copyright protection below). Common works of authorship include literary, musical, and dramatic works, motion pictures, and sound recordings (see: Copyright eligibility below). Copyright does not protect underlying ideas of the work, but rather the expression of ideas. For example, an original story in the abstract is not the subject of copyright, but the written story is protectable. Registration in the US Copyright Office, though beneficial, is not required