The term 'copyright symbols' refers to the © symbol, which is used to indicate that a work is protected by copyright law. The symbol is usually placed on the work itself or on its packaging, and it serves as a warning to potential infringers that the work is protected and that any unauthorized use of it may result in legal action. The acronym CEES stands for Copyright Essential Elements System, which is a system developed by the U.S. Copyright Office to help copyright owners identify the essential elements of their works. This system helps copyright owners determine what parts of their works are protected by copyright law and what parts are not.