Adding code to stop screenshots?

[eeeee]

Asking for a friend! Who wants to make an Educational website using nodebb.
Whats easiest way to prevent use of inbuilt screenshots, so the lesson content is not easily copied.
Would some customJS be able to do that?
Where to put that code?

[baris]

You can't prevent people from taking a screenshot of their screen.

[eeeee]

@baris yes, people can always get round it by using another device to take photo,
but quite a few websites deactivate the automatic screenshot buttons.

[eeeee]

Just incase anybody requires this in future, on windows I was able to darken the screen if 'printscreen' pressed just by adding some custom JS
document.addEventListener to detect the printscreen key up event codes.
It doesnt stop mobile screenshot, and guess it wont work on Mac either, but its some hinderance to screen copying on Windows at least

[josef]

@eeeee Pepole can take a screenshot in a built-in way in Windows even without the printscreen button, for example using the Snipping Tool
https://support.microsoft.com/en-us/windows/use-snipping-tool-to-capture-screenshots-00246869-1843-655f-f220-97299b865f6b

Use Snipping Tool to capture screenshots - Microsoft SupportYour Privacy Choices Opt-Out Icon

Learn how to use Snipping Tool to capture a screenshot, or snip, of any object on your screen, and then annotate, save, or share the image.

(support.microsoft.com)

[eeeee]

@josef yes, good point.
the eventListener is testing for printscreen button, and the 16 + 91 +83 keycode events to prevent that.
However if Sniping tool can be activated another way (without those keypresses) then it wouldnt stop it.