DMR from my recorded online couse

[Beef94]

Hello everyone, as the title suggests, I am attending a master's degree course and would like to download all the video lessons that are published weekly. It is a website created specifically for the course and I use a personal login to access it. Through it, I can view the lessons.
I have tried to download the videos using simple software, but even though the file size is correct, the video opens but the screen is black. Could you help me remove the DMRs and follow the lessons? I would like to avoid recording the screen. Thank you very much

[Obo]

[It's "DRM", not "DMR"...]

Without you telling us the URL the answer can only be: look at the various sticky threads. Maybe the answer lies within https://forum.videohelp.com/threads/416316-%5BRelease%5D-WidevineProxy2-Extension-Bypa...s-Lic-wrapping

Good luck!