In 1998 copyright law decided to address the copyright issues of multimedia format works. It is reviewed and exceptions are redone every 3 years.
Link to the Digital Millennium Copyright Act of 1998 (DMCA) 
Image by Mompl flickr 
Library of Congress 2015 exceptions https://copyright.gov/1201/2015/fedreg-publicinspectionFR.pdf
Congress final ruling of 2018 exceptions https://www.govinfo.gov/content/pkg/FR-2018-10-26/pdf/2018-23241.pdf
To license films for public viewing you can find contracts on company pages.
For Disney, Lionsgate, WB, and other big production companies purchase license form Movie Licensing USA. https://www.swank.com/public-libraries
For Dreamworks or 20th Century Fox and some international films https://library.mplc.org/
For documentaries and many other films a subscription to Kanopy can help. Many movies have public viewing rights. https://www.kanopy.com/
Kenneth D. Crews Chapter 15 from Copyright Essentials for Libraries and Educators on Music and Copyright.
