Need help downloading m3u8 TLS encrypted

[gurug]

Hello to all.

I would like to get some help for downloading link like this:

http://odna.octoshape.net/k5e2x7j8/cds/moviedrmorigin/20754SLVS.smil/playlist.m3u8

When I try to download it with ffmpeg with following command:

ffmpeg -i "http://odna.octoshape.net/k5e2x7j8/cds/moviedrmorigin/20754SLVS.smil/playlist.m3u8" -c copy test.mkv

I get "unable to open key file" error:

[tls @ 000000000301bc40] A TLS fatal alert has been received. Unable to open key file https://178.218.161.130/CAB/keyfile?r=13636&t=VOD&p=0 [hls,applehttp @ 0000000002bf9860] Error when loading first segment 'http://odna
.octoshape.net/k5e2x7j8/cds/moviedrmorigin/20754SLVS.smil/media_b896000_0.ts'
http://odna.octoshape.net/k5e2x7j8/cds/moviedrmorigin/20754SLVS.smil/playlist.m3
u8: Invalid data found when processing input

I read some posts here and I know I have to get .key for downloading, but it's not clear to me how to get it. I used also wireshark to capture data, but I'm lost to finding key ...

I would really appreciate if someone can help me, or guide me thru the process of getting key(s).

Thanks to all of you for help in advance, best regards from Slovenia.