[JonChesterfield]

This doesn't sound very likely. In order to show pixels on a screen, something has to write those numbers somewhere. Screenshot should be writing those pixels to a file as an image format, not consulting whatever programs are running to ask if there are areas that they don't want to draw.

[kalleboo]

The pixels are literally encrypted on PCIe on their way over to the GPU, it's quite draconian. Been this way since Vista ("Blu-ray is a bag of hurt" - Steve Jobs)

https://en.wikipedia.org/wiki/Protected_Media_Path

[JonChesterfield]

That is a crazy thing to do! Looks like it's windows specific at least.