KDM (Key Delivery Message) encryption is a tool used in the industry to curb piracy of films. When a DCP is created serve, it can be encrypted in such a way that it can only be played on a specific playback r at a set time. A KDM “key” is sent to the theater on a flash drive to “unlock” the feature for playback. Encryption is instrumental in protecting films from misuse or theft, but is not mandatory.