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How encryption for Cinema Movies works
The Cinema Industry is using its own standards for creating and distributing movies in a secure way. The DCI (Digital Cinema Initiatives) specification defines everything from file formats and encryption to the projection systems itself.
Metadata, Subtitles, Audio and Picture in seperate files CPL: Composition Playlist - A DCP can contain multiple audio and video streams which will combined in a CPL KDM: Key Delivery Message - A XML file which contains the cryptographical information to allow a movie playback on a specific DCI certified projection system DKDM: Distribution Key Delivery Message - Similar to a KDM, but for a remastering or distribution system, not for a projection system During the Mastering Process a static AES 128 bit key is generated and the original medium is converted into MXF files. The whole process relies on the fingerprint stored in the<enc:CipherValue> and that the recipient cinema has no access to the Projectors Private Key.
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