Proprietary streaming platforms (Netflix, Disney+, Hulu, Sky) do not serve raw MPD files to the public. They serve encrypted MPD files. The "exclusive" part of our keyword refers to the vendor-specific DRM wrappers attached to these manifests.
To turn an "exclusive" MPD into a playable file, a "handshake" must occur. This is the process security researchers and hobbyists obsess over: The player reads the MPD and identifies the ContentProtection Challenge:
# Using mp4decrypt (Bento4 suite) mp4decrypt --key 1:76a6c65c5ea762046bebe029b6acfe98 \ encrypted_video.mp4 decrypted_video.mp4