it’s drm protected and you need keys to decrypt. I already have these two extensions and it’s working.

https://github.com/FoxRefire/wvg/tree/next + https://addons.mozilla.org/en-US/firefox/addon/hls-stream-detector/ or https://github.com/DevLARLEY/WidevineProxy2

https://github.com/nilaoda/N_m3u8DL-RE (downloader and use the keys to decrypt the file)

example mpd “https://vodnowusoawsdash-cf.tvnow.de/pgrn/cves/sd/rtlplus/932203/1-1-1d-3-2-1-2.ism/v1.mpd” (the free trial video only gives me SD)

in .mpd, replace 3-2 with 1-1 to get HD (1080p)

you really are missing out staying on public. There are some Private trackers dedicated for content like this and have users who works in the film industry but are hard to join or impossible to join.

try docspedia.world and mvgroup.