While they seem to be adding an API for it, if you wanted you could just add a "block screenshots" API. This is already basically in place with DRM since the w

While they seem to be adding an API for it, if you wanted you could just add a "block screenshots" API. This is already basically in place with DRM since the windows screenshot utility won't screencap most DRMed content on win apps like netflix or even on firefox nowadays. What MS is adding on top of this is an API to check which tabs/web pages are visible and selectively black out web pages that are added to a given user level blacklist.