How to sell video lessons through the site?

Question

Referral programs

Friends, good evening.
I need advice.
There is a need to create a website where you can sell online video materials. Most engines only allow you to download files, but you need to provide access to the section of the site with videos and with a personal account. Tell me, on what engine can this be implemented, and are there any ready-made solutions?
And more importantly - the referral system. Here is an example: amlab.me

Answer 1

What other solutions are there. Site example - www.skillshare.com