Nuclear Foton

Your key, or UUID, is generated by the database when you join SL - it has nothing to do with your location or any other personal information. Everything in SL has a UUID - this is how each individual item is identified. Knowing the UUID of an object or an avatar is no need for concern. There is nothing anyone can do with it, in fact UUIDs are easily and routinely read by scripts used in obects within SL.