People have mentioned some good cases, but I think the most straightforward one is radiology. Imagine you have high quality 3D scans of people. You can strip t

People have mentioned some good cases, but I think the most straightforward one is radiology. Imagine you have high quality 3D scans of people. You can strip the names off of the files, but anyone can volume render the data to see what they look like (inside and out). There are some papers on adjusting the data, while hopefully preserving anything medically important, but that's obviously a challenging problem.