Most of the other requests were for non-content data such as login names, IP addresses or other low-level identifiers.

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For the time being, advertisers will have to depend on third-party identifiers such as Open Device Identification Number, Kamran says.

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Of the 2, 000 records of hybrids and wildcats looked at by the SWA team less than 20 were deemed to comply with the accepted coat-marking identifiers of the true wildcat.

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These fingerprints look deep into the characteristics of the machine, logging such things as the time zone, keyboard language, operating-system version and other key identifiers.

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Since the system is designed to determine the legal status of workers based on names, Social Security numbers and potentially personal biometric identifiers of every working age adult in America, worries about the system becoming a tool for ever-expanding federal purposes are legitimate.

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TOP-DRAWER BRITS have long had a penchant for standout socks, brandishing them as identifiers of social rank, sporting endeavors and private club membership.

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She notes that programming hooks in iOS 6 will provide an alternative to UDID for device-specific data, and that apps will eventually be forbidden from using the older identifiers altogether.

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