Securing your basketball system?

I was setting up a basketball system, you know, the one with the pole, backboard and rim? I finished setting it up and I put it on the driveway where I planned to just set it there, but something came through my mind. I'm afraid someone might steal it from me. So, how can I secure it to ensure no one would come and take it away? I was thinking of putting a sign on there saying 'I know where you live.'