Copyright protection exists for "original works of authorship when they become fixed in a tangible form of expression." Eligible

* Literary works.

* Musical works, including accompanying words.

* Dramatic works, including accompanying music.

* Pantomimes and choreographic works.

* Pictorial, graphic and sculptural works.

* Motion pictures and other audiovisual works.

* Sound recordings.

Generally Ineligible

* Ideas, methods, systems, principles, concepts. (Some may be eligible for patent protection.)

* Names, titles, slogans and other "trifles" in which creative authorship is slight. (Some may be entitled to protection under the general rules of law relating to unfair competition, or to registration under provisions of trademark laws.)

* Common or standard works in which there is no original authorship, such as standard calendars, height and weight charts, tape measures and rulers.

* Works in the public domain. A work falls into the public domain, and is available for use without payment or permission, when the copyright has expired. (Anywhere from 28 years to 100 years from the time copyright was secured.)

* Devices such as slide rules or wheel dials, used for measuring or computing.

* Blank forms, designed to reecord rather than convey information.

Works of the United States Government--published and unpublished--that are produced by employes as part of their official duties.

* Works not tangibly fixed, such as choreographic works not notated or recorded and improvised speeches not written or recorded.