This is the link to a free trial video: https://plus.rtl.de/video-tv/serien/die-unvermittelbaren-mit-martin-ruetter-882892/staffel-2-930427/episode-6-das-grosse-wiedersehen-932203
The browser log shows a bunch of request for different .m4s files. I assume the premium stuff would behave the same but I would like to know if I can rip that before I go for a trial version
You can use Streamfab https://dvdfab.at/downloader.htm Use the free Version/Test Version and then crack it with A Server Emulator https://cdm-project.com/Deja/DVDFabServerEmulator
If You need more Infos or Tools, look here: https://cdm-project.com/explore/repos
(I hope everything I said here still works, the last time I did this is over 1 year ago.)