How does Pyupdater work? There are no documntations about this

[Mezo1234-beep]

First of all, I want to thank you for this great work, it is really awesome.
But I have a problem which is I don't know how does the framework work? in order to decide if it fits with my project or not.

For example, I have these questions:

1. what is keypack? and why do we need them? what if am selling my project should I create a script to generate these keys on each customer machine?
2. Do it allow all customers who downloaded my project to be auto-update? Or it is just for my machine which I created the keypack file?
3. And can PyUpdater works with the VPS server? How can I set it up?

And many other questions that I don't have an answer to.
Thank you again for your great work.

Viva Pyupdater❤

NOTE: I know this is not an issue but I didn't know where to post it else.