The idea is that the raw photo files are cryptographically signed. Of course they're going to be edited, retouched, etc. But if a media outlet is challenged on

The idea is that the raw photo files are cryptographically signed. Of course they're going to be edited, retouched, etc. But if a media outlet is challenged on the veracity of the photo - as in, claiming it's totally fabricated, not just touched up - then the signed raw file adds credibility.