Roman numerals are used in film credits to mask the movie's age
the verdict
SUPPORTED
the evidence backs this
confidence 75/100
Evidence indicates that the traditional use of Roman numerals in film credits for copyright dates was intended to obscure or slow down a viewer's ability to easily calculate the exact age of the production.
Evidence for · 2
skeptics.stackexchange.com: Are Roman numerals used in the end credits of films to ...
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Notes that referenced sources state the convention probably arose to make it difficult for viewers to determine exact age.
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boards.straightdope.com: why use roman numerals for dates in the credits in movies? - Factual Questions - Straight Dope Message Board
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Discusses viewer speculation and widespread belief that Roman numerals were used to slow down recognition of a movie's age.