Will I turn my neighbor's or co-worker's lights on or off?

EnOcean radios have a 32 bit unique ID. In pratical terms, this means there are close to 5 billion seperate radio ID's. It is virtually impossible to have two receivers in the same facility as each other and within range.

The 32 bit radio ID is part of every telegram sent by a transmitter/transceiver so only those devices that are linked will respond.