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The Usage Data that we collect may include information such as your device data, including your mobile devices, sensor data, device signals, device parameters, device identifiers that may uniquely identify your devices, including your mobile device, web request, Internet Protocol address, browser type, browser language, referring/exit pages and URLs, platform type, the date and time of your request, and one or more cookies that may uniquely identify your devices or browser.[1]
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This data is certainly not anonymous by GDPR standards. Identifiers that uniquely identify a device will in some cases(ex, single-user devices) also be unique identifiers to a single person. That is enough for the data to be considered Personal Data in the context of GDPR.
‘personal data’ means any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly, in particular by reference to an identifier such as a name, an identification number, location data, an online identifier or to one or more factors specific to the physical, physiological, genetic, mental, economic, cultural or social identity of that natural person[2]