What library/plugin is used to protect the page from viewing the source code?

Question

Data protection

There is a site dekuzu.com

Here is one of its pages:
https://www.dekuzu.com/ru/2020/02/sell-phone-infri...

I want to see the source code of the page. I'm using Chrome 83.0.4103.116 (Official build), (64 bit)
It doesn't work.

How did they manage to disable:
* right mouse button
* CTRL+U
* F12

This is the first time I've seen this.

Answer 1

The site just catches clicks. You can still view the page code by adding view-source: before the link, and open the console through the menu. Protection from the very lazy.

Answer 2

they are just hacks,
open the developer console through the browser menu, there is a script right in index.html

How did they manage to disable:
* right mouse button
* CTRL+U
* F12

window.onkeydown = function(e) { 
  // какую кнопку юзер нажал?
}

Answer 3

This site was made by mom's programmers. Accumulated "protection" from the Internet and it's done) I do not advise you to do this, you will lose users.
Additional Tools --> Developer Tools:

spoiler

"Explore" "protection" further. We take curl or (in my case python), do not add headers and do not change the user-agent. Making a request:

import requests

response = requests.get('https://www.dekuzu.com/ru/2020/02/sell-phone-infringe-copyright.html')
print(response.text)

spoiler

As you can see, this is "protection" from housewives. But why should they copy it, xs.

What library/plugin is used to protect the page from viewing the source code?

You generate a picture from the text on the server, "decorate" it with watermarks and give it to the user. Who will use this site? - That's another question :)

Attention! Not to look nervous!

Answer 4