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Digital cinema (D-cinema) operations -- Generic extra-theatre message format
This standard presents a specification for a **generic Extra-Theatre Message (ETM) format** for use with unidirectional communications channels used in security communications for Digital Cinema (D-Cinema) systems.
The ETM specification is a generic XML security wrapper that includes specific fields which can be extended to carry different kinds of information to meet various application-level requirements. (For example, the Key Delivery Message (KDM) is a specific instance of this format.)
The ETM uses W3C Extensible Markup Language (see [XML]) to represent the information payload. It provides security using the XML encryption and signature primitives.
Note: The brackets convention '[...]' as used herein denotes either a normative or informative reference.
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