How to protect (encrypt) a link in nginx?

Question

Nginx

Of course, I googled this issue and found two solutions in the form:
kaltura secure token ( https://github.com/kaltura/nginx-secure-token-module)
and
secure link module ( https://nginx.org/en/docs /http/ngx_http_secure_lin...
But, unfortunately, I haven't mastered the elementary logic of how these modules
work.Could you please explain to a beginner "on your fingers"?I.e .
how the request is given to the user from the application. The URL is already encrypted when accessing the player or the module simply does not return files by unencrypted url?