I work for a software company that produces something similar for school cafeteria use. The points of reference on the print are so minimal that we've had to work very hard just to get a decent read. The chances of someone using the code outputted by our algorithm are nil. It is completely unusable data except by our program. The bottom line is that that unless the program is retaining an image of a child's fingerprint, there is no privacy concern here. Anyone who says otherwise is wallowing in their own FUD.