Thirty-Six, Twenty-Four, Thirty-Six

The film '36-24-36' (frequently cited as '36902' or '36 24 36' in various catalogs) is a sexploitation/nudie-cutie film released in 1970 by the Dallas-based Sack Amusement Enterprises. Under the Copyright Act of 1909 (applicable to films before 1978), a work required a valid copyright notice on the release prints and, for 1970 releases, registration with the U.S. Copyright Office to maintain statutory protection. A search of the Library of Congress Catalog of Copyright Entries (CCE) and the online Copyright Office database yields no original registration for this title under Sack Amusement Enterprises or its principals. Furthermore, the film has been identified by multiple film historians and distributors (such as Something Weird Video and Alpha Video) as having fallen into the public domain due to publication without the mandatory copyright notice or failure to comply with registration formalities. It is a staple of public domain 'grindhouse' collections and has been widely distributed by PD-specialist labels for decades without legal challenge.