48 C.F.R. §§ 27.405-2
The clause at 52.227-18, Rights in Data-Existing Works, is for use in contracts exclusively for the acquisition (without modification) of existing works such as, motion pictures, television recordings, and other audiovisual works; sound recordings; musical, dramatic, and literary works; pantomimes and choreographic works; pictorial, graphic, and sculptural works; and works of a similar nature. The contract may set forth limitations consistent with the purposes for which the works covered by the contract are being acquired. Examples of these limitations are means of exhibition or transmission, time, type of audience, and geographical location. However, if the contract requires that works of the type indicated in this paragraph are to be modified through editing, translation, or addition of subject matter, etc. (rather than purchased in existing form), then see 27.405-1.
48 C.F.R. §§27.405-2