Need to block print screen on any device.

Some of my clients save my images.
I don't allow to save images and I do put watermark on each. Today, I met a client. They came by to place an order of photo card. She showed me what they want to use. It's a printed image. Although I put watermark on it, but they seems to brush it out. She still have bunch of prints and showed me some out of her bag.
Maybe they saved print screen from her smart phone, and photoshop them....

Is there any suggestion to block them?

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