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In some cases the system protection ID is not present in the contents or in their metadata. This define is used to set the value of the "system_id" field in GstProtectionEvent, with this value, the application will use an external information to choose which protection system to use. Example: The matroskademux uses this value in the case of encrypted WebM, the application will choose the appropriate protection system based on the information received through EME API. https://bugzilla.gnome.org/show_bug.cgi?id=797231
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