Ray, Fred Olen (1991) The New Poverty Row: Independent Filmmakers As Distributors, McFarland & Company, pp. page 29 ISBN: 0899506283. ”Like most Filmgroup releases, Corman did not believe the film had much life in it after its initial theatrical run (it had cost only $28,000 to produce) and did not bother to copyright it.”
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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