Why two library.json files?

There is a library USBDevice for mbed framework (ID = 2820). When I include it in my project, there are library.json file and .library.json file. Why is it so and which of them is used by library manager?

PlatformIO Library Crawler creates .library.json with internal private data and later LDF will use them. .library.json has higher priority than library.json.

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