Not all works are covered by copyright. Section 102(a) of the Copyright Act defines
what is protected; “Copyright
protection subsists, in accordance with this title, in original works of
authorship fixed in any tangible medium of expression…” (italics added)
It goes on to state, “Works of authorship include the following categories":
(2) musical works, including any accompanying words;
(3) dramatic works, including any accompanying music;
(4) pantomimes and choreographic works;
(5) pictorial, graphic, and sculptural works;
(6) motion pictures and other audiovisual works;
(7) sound recordings; and
(8) architectural works
Section 102(b) of the Copyright Acts states that "In no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work."
In other words, ideas are not copyrightable nor are speeches (unless written down). The item must be in a "tangible form of expression" before a copyright can be attached to it.
Items used commonly - such as a calendar or a list without creativity - like a phone book, are also not eligible for copyright protection.
Another type of material that is not covered by copyright are government documents. These include bills, laws, congressional reports, census studies and all other types of material that the federal government in involved in publishing.
The amount of time an item is covered by copyright is not limitless. So, while some works are never protected by copyright, other items that are protected by copyright can have that protection expire. In both of these instances, items are considered to be in the "public domain".
Here are two ways to check to see if a copyright has expired and/or if a work is in the public domain: