Apple warned the iOS development community last August that it would start rejecting applications submitted to the App Store for accessing a user’s unique identifier (UDID). In case you didn’t know, every iPhone, iPod touch, and iPad possesses a unique alphanumeric string used for registration and tracking.
Amid privacy concerns from the U.S. Congress and other groups regarding how apps use an iOS device’s personal info, Apple has decided to start enforcing its new policy in the App Store.