Hi Pavel,
Thank you for sharing your comments.
If my paid subscribers/students will download videos for personal use, I don't see big problem here unless their intention was to redistribute and commercialize these branded contents which will be a copyright infringment.
I see that Youtube has 3 types of Visibility (ACL) options: Public, Unlisted (video link based access) and Private (by email invitation). I wonder if I make a video as unlisted, can I still embed and run it on my site? Did anyone try this way? Is it recommendable?
I will check Vimeo Business.
I will check WISTIA too.
Any further comments are welcome. Thanks.