Trusting the Trusted Device List

In digital cinema, a trusted device list is a commercial product and service provided by numerous suppliers of Key Delivery Message (KDM) generation services. A KDM is required to unlock a movie for playout in a cinema. The Trusted Device List (TDL) confirms that the equipment for which the KDM is targeted is authentic and trusted. Maintaining an accurate TDL, therefore, is an important role of KDM service providers. However, common policies do not exist to guide such service providers. This is an important area to address as digital cinema moves towards an equipment replacement cycle.

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