PA: If the work contains an audiovisual element, such as a slides, film or videotape regardless of whether there are any sounds.

SR: If the work does not contain an audiovisual element, but contains an audiotape or disk in which sound-recording authorship is claimed.

TX: If the work contains only text, such as a computer program that produces a textual screen display.

SINGLE REGISTRATION: All copyrightable elements of a multimedia work may be registered with one application, deposit and fee if 1) the elements are not published, or if published, they are published as a single unit; and 2) the copyright claimant is the same for each element (i.e. one person or company owns all the elements).

SEPARATE REGISTRATION: Elements may be separately registered. Separate registration is required when any element is published separately or when there are different copyright owners of elements.

Click here to link to United State Copyright Office and download the above mentioned forms.