The Mistresses of Dr. Jekyll

The film (originally 'El secreto del Dr. Orloff') is a Spanish-Austrian co-production directed by Jesús Franco. It was released in the United States in 1964 by International Film Industries. Under the rules for films released between 1964 and 1977, US copyright protection depends on the presence of a valid copyright notice on the release prints. No record of a US copyright registration was found in the Catalog of Copyright Entries (CCE) or the Stanford Renewal Database. While many foreign films of this era had their copyrights restored via the URAA in 1996, such restoration requires the film to have been under active copyright in its source country (Spain) on January 1, 1996. While likely still protected in Spain, the lack of a US registration or documented restoration filing (Form NIE) makes its US status legally 'uncertain' without physical inspection of a 1964 release print for a valid notice. The film is frequently circulated by budget labels and on public domain sites, which is a common signal of a defective notice, but not definitive proof of public domain status. Note: generated without live web grounding (the grounded research engine was unavailable). Verify the cited sources independently before relying on this determination.