Security Alert - Key Cloning

[NemesisUK]

Whilst researching info on electronic key Battery charge level notification I came across this in my handbook.

Looks like Lexus put some level of security into the car's system regarding key cloning

■If “A New Key has been Registered 
Contact Your Dealer for Details” is 
shown on the multi-information display
This message will be displayed each time 
the driver’s door is opened when the doors 
are unlocked from the outside for approximately one week after a new electronic key 
has been registered.
If this message is displayed but you have not 
had a new electronic key registered, ask any authorized Lexus retailer or Lexus 
authorized repairer, or any reliable repairer 
to check if an unknown electronic key 
(other than those in your possession) has 
been registered.