You can screengrab at the interface between the decoder in the monitor and the panel itself, using an LVDS capture card. Not cheap at the moment, and you still have to process the gigabits per second of uncompressed video, but you can expect the Chinese to come up with some inventive and low-cost solutions if they start locking down the other routes... in fact a lot of DRM-stripping hardware already exists for sale, if you know where and what to look for.