Click on the device name on the left hand side of the screen. This will bring up information about your device on the right.
Click where it says "Serial number." This will change it to "Identifier: UDID."
Enter the first five numbers of your UDID here. If it comes up red, read the rest of the numbers and see if they match yours. If they do, your device information was released and you should change your iTunes password to make sure your information is safe.