The term "documentary materials" means any materials on which information is recorded. It includes, but is not limited to, written or printed materials, photographs, films or negatives, audio or video tapes, and materials upon which information is electronically or magnetically recorded, such as computer disks. It does not include materials which constitute contraband, the fruits or instrumentalities of a crime, or things otherwise criminally possessed. See 28 C.F.R. § 59.2(c).
The term "disinterested third party" means a person or organization not reasonably believed to be a suspect in the criminal offense for which the materials are sought nor related by blood or marriage to such a suspect. See 28 C.F.R. § 59.2(b).