An identifier that can be used to identify the host device. The value is unique for every app, but is stable on a device across uninstall and reinstall. Any use of this value for tracking user information must be in compliance with international privacy law.
Yes, I read it. I just thinking how to identify users who pay for some exclusive functions. Weather API is big problem. I can not afford to get my API key to the public. Only solution is specific unlock key for one concrete device.