Copyright is a type of intellectual property that protects original works of authorship as soon as an author fixes the work in a tangible form of expression. Copyright law gives creators of original material the exclusive right to further use and duplicate that material for a given amount of time. The primary objective of copyright is to induce and reward authors, through the provision of property rights, to create new works and to make those works available to the public to enjoy. Copyright covers both published and unpublished works, including literary, dramatic, musical, and artistic works, such as poetry, novels, movies, songs, computer software, and architecture. However, copyright does not protect facts, ideas, systems, or methods of operation, although it may protect the way these things are expressed. Copyright owners have the exclusive right to reproduce the work, prepare derivative works based upon the work, distribute copies or phonorecords of the work to the public by sale or other transfer of ownership or by rental, lease, or lending, and perform and display the work publicly. Copyright does not prohibit all copying or replication, and in the United States, the fair use doctrine permits some copying and distribution without permission of the copyright holder or payment to the same. The cost of registering a copyright varies depending on what is being copyrighted and whether the registration is filed online or by paper.