iPhone Screen Capturing Question

I'm writing an iPhone App that allows people to share images that may be copyrighted(not illegally). The issue I am having is that I'm looking for a way to work around the screen capturing. Is there any possible way you can disable screen capturing or possibly distort the image in some way so capturing will be useless, maybe even block the imag开发者_运维知识库es when a screen capture is trying to be taken?

That is impossible because it is embedded in iOS itself. Maybe some private APIs, but then there is no app store for your app.

Watermarking the images may be a good half-way solution.

iOS screen capture does not support capturing everything. It does not capture OpenGL or YouTube for example. So if you can manage to implement showing images using OpenGL instead of the simple way using UIKit they would not show up on a screen shot.