Most developers that publish on Play aren’t thoughtful (or skilled for that matter). A thoughtful developer might handle failing license checks gracefully, but then again, a thoughtful developer wouldn’t use a license server for mobile applications to begin with. while in the subway (no reception) or when on vacation (no roaming plan).

Your ability to use the app in question depends on your network connectivity and it may fail to work at inconvenient times, e.g.

In other words: any developer requesting _LICENSE for his app, documents a complete disregard for your privacy.

You may only want Play, but you also get every other Google service including background services like Analytics (user/activity tracking) which you definitely don’t want. You cannot use the app in question on any device without (enabled) Gapps.What does this mean for you in the bigger picture? The exact strategy is completely up to the developer. A poorly done app may require a license check on every start and refuse to operate entirely if it fails, a more user friendly one might only check infrequently and gracefully shut down if it fails subsequently. There is no way of telling when and how often this license check is performed or what will happen exactly when it fails. Any requesting app intents to ask the Play license server (at undisclosed times) if an account on the device legally purchased it.

CHECK_LICENSE is not a system permission, but declared by the Play client on your device.

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