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Device UUID, DeviceName

Other Parts Discussed in Thread: CC2540

I'm using the Texas Instrument CC2540.
1. I would like to understand why the device UUID has a different value when visible from different iPhone / iPad
How to have an unique UUID for each BLE device ?

From the Keyfob demo source code:

2. I have modified the deviceName info from the broadcast data with:
GAPRole_SetParameter( GAPROLE_SCAN_RSP_DATA, sizeof ( deviceName ), deviceName );
The pb is that it is very easy to "fake" the keyfob by using the same deviceName on another keyfob...
How to avoid the pb ?

3. attTagName:
GGS_SetParameter( GGS_DEVICE_NAME_ATT, GAP_DEVICE_NAME_LEN, attDeviceName );
When use this parameter ? why it is different to the deviceName ?