I've never seen screenshot not working
But in any case, if your friend thinks his/her photos can't be taken once they appear on a computer screen, they are sadly mistaken.
Anyone with an IQ above their show size should be able to work out that they can, as a very last resort, take a high resolution photo of the image on the screen. For most uses, the quality of the photo will be good enough especially after it is cropped and enhanced if required in Photoshop.