A copyright protects original works of authorship, for example, books, songs, paintings, performances, architectural drawings, movies and software. A copyright is acquired automatically upon creation. A copyright can be federally registered with the U.S. Copyright Office. A copyright should be properly marked in order to provide notice to third partiies that the work is the subject of a copyright.
A copyright is beneficial in that it can be used to prevent third parties from copying an original work of authorship.
A written agreement is necessary in order to properly transfer, authorize or use a copyright.