[Question] This is read only, right?

[resignedScientist]

If I understand correctly, this library can only read the NFC Tag, but cannot write to it, is that correct?

[johnnyb]

Both. However, I haven't tested it much, as this is a port from an old Java version, and haven't had time to really play with it. But it should support both reading and writing with the proper keys.

Honestly, to read these, you don't even really need a library. The standard NFC libraries should work fine.