I would think that in a tech convention there would already be some kind of wireless/wired plan in place. Maybe for a non-tech related convention or gathering this may be useful for those more technologically inclined.
That is probably the best way to use the technology I've heard. Use a doubleblind system, the tech enhancing the print doesn't know who or what case the print is from, and encode into the software (Photoshop for Uncle Sam maybe?) no ability to add or detract from the original print, only change contrast, hues, color saturation, etc... in order to make the print easier to ID. NO paintbruch, rubber stamp, or any other cursor oriented tool to change the existing image.
I would think that in a tech convention there would already be some kind of wireless/wired plan in place. Maybe for a non-tech related convention or gathering this may be useful for those more technologically inclined.