Careful, I've seen an uptick in malicious files being uploaded for popular tv shows. Including murderbot. You likely downloaded one of those. There shouldn't be any DRM in pirated media. I've noticed it mostly in episodes before they are released. So the day after murderbot episode 2 came out my sonarr started trying to download episode 3. They were all malicious files, on all my trackers except for my private one. Carefully look at the file, if it isn't legit, since you got it from a private tracker, flag it and boot the user uploading crap.
If not, could be a transcoding issue. Try watching it directly with VLC.