Car remoter code grabber ?

Today our teacher showed a letter (a copy paper looks like from a letter, or email but handwriting). It is about that car thieves clone remoter keyless code. The teach said it is "code grabber"

I searched on internet. Here a similar article about the car code grabber: Car Thieves Clone Remote Keyless Entry Codes to Unlock Doors

Please read it, and carefully use your keyless remoter. The teacher suggested DO NOT use keyless remoter as possible.

About more information , Here is another article: High-Tech Thieves and the Gadgets They Use