@maxmustermann
So obviously there's no such thing as "invisibly watermark". So then the question is, is it adding an overlay to the rendered frames, that is so subtle that it is not noticeable to the naked eye, and you need additional image manipulation tools + to know exactly where and when to look to find it? It could also be that it inserts the watermark only one frame per second. So imagine playing at 60fps and trying to spot that.
@maxmustermann
If the watermark is small enough, you might foil it with just adding a smidgen of blur over the entire image. For now, we won't know until this starts getting adopted by devs, and leaks start coming out. Then we can start analyzing the footage for what actually gets inserted into the frames.
For all we know for now, Denuvo could be lying out of their asses, and just rely on people blindly believing them, and being afraid to leak anymore.
It'll be a bit like adding a lot of yellow dots to a printed paper to make the id encoded in the tracking dots unreadable.