If a PRO is found in the MPD, it takes priority over a PRO in an init segment PSSH box. The Bento4 tools will automatically insert a PlayReady PSSH box in the init segments. With most PlayReady DASH clients, it is a requirement that at least the init segment PSSH box be present (when it is not, some players will not correctly detect that the media is encrypted). There are 2 places where the PRO can be conveyed: This header object includes fields like the license acquisition URL (LA_URL), the KID, and other fields. When using PlayReady DRM, the DRM signaling is in the form of a PlayReady Header Object (PRO).
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