Or it can keep others from reading your screen.

"Then how do you keep people from reading each other's files?"

He had put on his own sunglasses, and the dark lenses kept her from reading his expression.

How could she keep him from reading her mind?

"Is there any way to keep her from reading my thoughts?"

The physical pain and thoughts of the girls kept me from reading any of them.

He was suddenly very glad that Lwaxana's borrowed cap kept her from reading anyone's mind.

A spell, he feared, to keep anyone from reading it.

He did his damnedest to shut them out and keep them from reading anything.

I'm not consciously doing anything to keep you from Reading me.