Apple had already begun blocking UDIDs on some apps and announced last fall that the iOS 6 would not support UDIDs. It introduced a new Identifier for Advertising (IFA) to replace it, creating a “non-permanent, non-personal device identifier” according to Apple. At the same time Apple added a privacy setting to iOS called "Limit Ad Tracking." The feature is left off by default. By turning it on, users block data collection by ad networks.
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The pressure to move away from the unique identifiers increased after a hacker group AntiSec released millions of UDIDs for iPhones, iPads and iPod touches in September. The hacker group claimed that it had hacked into an FBI laptop, but the hacked source was eventually revealed to be the publisher BlueToad.
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