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Wikipedia:
"F for Fake (
French:
Vérités et Mensonges) is the last major film completed by
Orson Welles. Initially released in 1974, it focuses on
Elmyr de Hory's recounting of his career as a professional
art forger; de Hory's story serves as the backdrop for a fast-paced, meandering investigation of the natures of authorship and authenticity, as well as the basis of the value of art. Far from serving as a traditional documentary on Elmyr de Hory, the film also incorporates Welles's companion
Oja Kodar, notorious "hoax-biographer"
Clifford Irving, and Orson Welles himself, in an autobiographical role."