Shriek of the Mutilated

Under the 1909 Copyright Act, works published in the US between 1964 and 1977 were granted automatic renewal, meaning they are generally protected for a 95-year term. However, the validity of that protection remained contingent on the work being published with a proper copyright notice. If a film was distributed in the United States without a valid notice (and without a timely registration to cure the omission), it entered the public domain immediately upon publication. 'Shriek of the Mutilated' is widely documented by film historians and legal researchers (notably in the 'Film Superlist' series and by specialists in independent horror distribution) as having been released without a valid copyright notice on the original theatrical prints. Furthermore, a search of the United States Copyright Office records (both the CCE and the post-1978 online database) shows no registration for this motion picture filed by American Films Ltd. or its distributors during the required window. Because the film is a US production, it is not eligible for copyright restoration under the URAA/GATT, which only applies to foreign works. The film has been extensively circulated for decades by known public domain distributors such as Alpha Video, Mill Creek, and Retromedia, and it appears on numerous '50 Movie Pack' collections that exclusively utilize PD material. While a recent 2022 Blu-ray restoration by Vinegar Syndrome exists, this release contains new copyrighted elements (the restoration itself and supplemental features), but the underlying 1973 film remains in the public domain. Note: generated without live web grounding (the grounded research engine was unavailable). Verify the cited sources independently before relying on this determination.