Image metadata is what led to software pioneer John McAfee's arrest, which has led a lot of people, especially lawyers, to ask what metadata is and how it may affect litigation.
It's not an incomprehensible technology, but it is a powerful tool for finding information about digital documents and images. Unless you take the time to strip it out, there is revealing metadata on every digital file you have, including briefs and evidence photos.
You don't want to give anything away about your own case, but you also want to know how to get this information from your opponents. So it's time for a crash course in metadata.