The task is: Prevent the ability to take screenshots on an 6.0.x android OS globally. What I mean by "globally" is to exclude that function and block it completely so that even if the device is to be infected with a screenshot-taking malware it should not be able to do so. I am interested in screenshot-prevention in all apps and even when no apps are running, everywhere. Thanks in advance!
upd. I am really sorry if that question is not stated clearly but I thought I could find some help here at least some points in the direction I should look for. I think this question will be useful for others too if answered.