Lock PrintScreen function

You can not disable the screen grabbing from the web browser, it would only be possible by installing additional software on the user's PC.

There are some IRM (Information Rights Management) tools available that do this, such as securing Windows / DirectX API calls and also video memory monitoring, such as Oracle IRM or Microsoft IRM technology.

Especially the latter may be of interest as there is also an add-on to Rights Management for Internet Explorer.

But as others have said, any IRM / DRM technology controversies and you should understand that most of the time will limit or irritate your users.

Source:

link

Would something like this not work?

$(document).keyup(function(e){
  if(e.keyCode == 44) return false;
});