That might help, or other techniques used by some apps ('SnapChat'?) that purport to prevent the taking of screengrabs. But, it's also not that hard to type in

That might help, or other techniques used by some apps ('SnapChat'?) that purport to prevent the taking of screengrabs. But, it's also not that hard to type in 25 letters manually, to a nearby computer. Cheaters gonna cheat... you ultimately have to play with people you trust, or choose to trust.