How to download this DRM free livestream? (MPD or M3U8)

[dappaulu]

So, I'm watching a music festival and I'd like to capture a show that will happen later today (in about 5h), but, unfortunately, its livestream is DRM protected,

I tried with steamlink, yt-dlp and ffmpeg and all of them doesn't let me download it because of the AES protection or something like that. I think I need the key, but I have no idea on how to grab it.

That's the stream link: (Portugal VPN needed)

https://www.rtp.pt/play/direto/palco-nos

MPD:

https://streaming-live.rtp.pt/liverepeater/especiaiscamClean3HD.smil/manifest.mpd

M3U8:

https://streaming-live.rtp.pt/liverepeater/especiaiscamClean3HD.smil/playlist.m3u8

[skipmack46]

Stream Url(s): https://streaming-live.rtp.pt/liverepeater/especiaiscamClean2HD.smil/manifest.mpd

Decryption Keys:
--key 61c2ef50a0d632e78d88647d81f5e0b7:3ac45eaf59bbf1978 66a8ce217d81e73

[Subtitles]

You can use TubeDigger in REC mode, if you don't want to waste time hunting for codes

[sj101]

Stream Url(s): https://streaming-live.rtp.pt/liverepeater/especiaiscamClean2HD.smil/manifest.mpd

Decryption Keys:
--key 61c2ef50a0d632e78d88647d81f5e0b7:3ac45eaf59bbf1978 66a8ce217d81e73

How did you obtain this? I've been desperate to integrate the RTP channels into an external player, but cannot seem to find how to do it.