This statement regarding the most frequent reason for a title discontinuation was provided by Films on Demand - 

“We license programs from production companies worldwide. Producers often have to license music and footage when they produce a program. These licenses run a certain number of years, e.g. 5, 7, and 10 years. When a license expires, producers have to either renew or stop all distribution and exploitation of the program. This is the reason why we have to discontinue programs when a producer sends us a discontinuation notification. Oftentimes, we have multiple programs on any given topic. We hope that you will find engaging replacements by performing a new search on our site. Additionally, our content team is available if you need help finding content on a topic.
- The Acquisitions Team”

Films are culled twice annually by FOD. All faculty will be notified of deleted titles when the Library is alerted. If a title you use is on the list, tell Christina & she will try to license it for you.