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In order for a decrypter element to decrypt media protected using a specific protection system, it first needs all the protection system specific information necessary (E.g. information on how to acquire the decryption keys) for that stream. The GST_EVENT_PROTECTION defined in this commit enables this information to be passed from elements that extract it (e.g. qtdemux, dashdemux) to elements that use it (E.g. a decrypter element). API: GST_EVENT_PROTECTION API: gst_event_new_protection() API: gst_event_parse_protection() https://bugzilla.gnome.org/show_bug.cgi?id=705991
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